diff --git a/flake.lock b/flake.lock
index 2982e21..6c7b2d7 100644
--- a/flake.lock
+++ b/flake.lock
@@ -904,11 +904,11 @@
         "ragenix": "ragenix_5"
       },
       "locked": {
-        "lastModified": 1654726516,
-        "narHash": "sha256-kIMAjXmKVfBvfXeb5rh4KuPopZR7fpNDbDAVrFPp9zE=",
+        "lastModified": 1655665199,
+        "narHash": "sha256-6/NpaXqIDIpgVYuMb/6dbV1p2Hf/BriNDnif/Y80Wv4=",
         "owner": "input-output-hk",
         "repo": "devshell-capsules",
-        "rev": "c41ccfdcb5e6b2d36d1cc55c59ae875724ce8567",
+        "rev": "437b99c714ca924c05a2cc428b92b26e8932fa5f",
         "type": "github"
       },
       "original": {
@@ -1177,11 +1177,11 @@
         "utils": "utils_24"
       },
       "locked": {
-        "lastModified": 1652824972,
-        "narHash": "sha256-zHPw27TsKnTNI07RFzCDvxYiqgyUINkDClbWdLcCDRU=",
+        "lastModified": 1652949808,
+        "narHash": "sha256-/t+4a5e2PTRdi11VE7IlQwL6oFwRDPWwL9yslcYCbn4=",
         "owner": "input-output-hk",
         "repo": "cicero",
-        "rev": "1f8ecb91f07126fbc51f6ee43f327e12fd0bf488",
+        "rev": "b8eb9d943c37d6302f7ba58907874de878964d66",
         "type": "github"
       },
       "original": {
@@ -1313,11 +1313,11 @@
         "yants": "yants_6"
       },
       "locked": {
-        "lastModified": 1648237091,
-        "narHash": "sha256-OtgcOt/CB0/9S0rh1eAog+AvAg9kF6GyAknyWOXiAZI=",
+        "lastModified": 1655854240,
+        "narHash": "sha256-j74ixD7Y0bF3h0fBJFKPR9botlrMu0fgG/YsiUKybko=",
         "owner": "divnix",
         "repo": "data-merge",
-        "rev": "b21bcf7bd949ac92af3930ecb1d3df8786384722",
+        "rev": "0bbe0a68d4ee090b8bbad0c5e1e85060d2bdfe98",
         "type": "github"
       },
       "original": {
@@ -1562,6 +1562,30 @@
           "nixpkgs"
         ]
       },
+      "locked": {
+        "lastModified": 1653917170,
+        "narHash": "sha256-FyxOnEE/V4PNEcMU62ikY4FfYPo349MOhMM97HS0XEo=",
+        "owner": "numtide",
+        "repo": "devshell",
+        "rev": "fc7a3e3adde9bbcab68af6d1e3c6eb738e296a92",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "devshell",
+        "type": "github"
+      }
+    },
+    "devshell_19": {
+      "inputs": {
+        "flake-utils": "flake-utils_34",
+        "nixpkgs": [
+          "std",
+          "kroki-preprocessor",
+          "std",
+          "nixpkgs"
+        ]
+      },
       "locked": {
         "lastModified": 1650900878,
         "narHash": "sha256-qhNncMBSa9STnhiLfELEQpYC1L4GrYHNIzyCZ/pilsI=",
@@ -2396,11 +2420,11 @@
     },
     "flake-utils_31": {
       "locked": {
-        "lastModified": 1638122382,
-        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
+        "lastModified": 1653893745,
+        "narHash": "sha256-0jntwV3Z8//YwuOjzhV2sgJJPt+HY6KhU7VZUL0fKZQ=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
+        "rev": "1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1",
         "type": "github"
       },
       "original": {
@@ -2439,6 +2463,21 @@
         "type": "github"
       }
     },
+    "flake-utils_34": {
+      "locked": {
+        "lastModified": 1642700792,
+        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "flake-utils_4": {
       "locked": {
         "lastModified": 1634851050,
@@ -3555,6 +3594,25 @@
         "type": "github"
       }
     },
+    "kroki-preprocessor": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_69",
+        "std": "std_4"
+      },
+      "locked": {
+        "lastModified": 1654109943,
+        "narHash": "sha256-g5TC2L09JziXQmXwdUdJMCGYloblbTBjM5VX2R+E4vk=",
+        "owner": "input-output-hk",
+        "repo": "mdbook-kroki-preprocessor",
+        "rev": "a294ca451b408cff1987e48d7c394e062c347e19",
+        "type": "github"
+      },
+      "original": {
+        "owner": "input-output-hk",
+        "repo": "mdbook-kroki-preprocessor",
+        "type": "github"
+      }
+    },
     "lowdown-src": {
       "flake": false,
       "locked": {
@@ -3843,11 +3901,11 @@
         "nixpkgs": "nixpkgs_63"
       },
       "locked": {
-        "lastModified": 1650568002,
-        "narHash": "sha256-CciO5C3k/a7sbA+lW4jeiU6WGletujMjWcRzc1513tI=",
+        "lastModified": 1655533513,
+        "narHash": "sha256-MAqvv2AZbyNYGJMpV5l9ydN7k66jDErFpaKOvZ1Y7f8=",
         "owner": "nlewo",
         "repo": "nix2container",
-        "rev": "2cd391fc65847ea54e3657a491c379854b556262",
+        "rev": "2d47dbe633a059d75c7878f554420158712481cb",
         "type": "github"
       },
       "original": {
@@ -4328,11 +4386,11 @@
     },
     "nixlib_5": {
       "locked": {
-        "lastModified": 1650156377,
-        "narHash": "sha256-a5YlF/WX8psCigVPNXWwyq5poZdJfUSwzLM4qEvaGMg=",
+        "lastModified": 1655599917,
+        "narHash": "sha256-kjZbt5WdTrnjMxL79okg9TCoRUdADG50x/TWozbyTsE=",
         "owner": "nix-community",
         "repo": "nixpkgs.lib",
-        "rev": "26c5f0827224e4a01422d5c37c8021c2e5765611",
+        "rev": "5fb55578aa2f1a502d636a8ac71aece57cb730bb",
         "type": "github"
       },
       "original": {
@@ -5764,11 +5822,11 @@
     },
     "nixpkgs_62": {
       "locked": {
-        "lastModified": 1650156377,
-        "narHash": "sha256-a5YlF/WX8psCigVPNXWwyq5poZdJfUSwzLM4qEvaGMg=",
+        "lastModified": 1655599917,
+        "narHash": "sha256-kjZbt5WdTrnjMxL79okg9TCoRUdADG50x/TWozbyTsE=",
         "owner": "nix-community",
         "repo": "nixpkgs.lib",
-        "rev": "26c5f0827224e4a01422d5c37c8021c2e5765611",
+        "rev": "5fb55578aa2f1a502d636a8ac71aece57cb730bb",
         "type": "github"
       },
       "original": {
@@ -5779,11 +5837,11 @@
     },
     "nixpkgs_63": {
       "locked": {
-        "lastModified": 1642451377,
-        "narHash": "sha256-hvAuYDUN8XIrcQKE6wDw4LjTCcwrTp2B1i1i/5vfDMQ=",
+        "lastModified": 1654807842,
+        "narHash": "sha256-ADymZpr6LuTEBXcy6RtFHcUZdjKTBRTMYwu19WOx17E=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e5b47c5c21336e3fdd887d24c7e34363fa09c6d7",
+        "rev": "fc909087cc3386955f21b4665731dbdaceefb1d8",
         "type": "github"
       },
       "original": {
@@ -5872,15 +5930,15 @@
     },
     "nixpkgs_69": {
       "locked": {
-        "lastModified": 1652739558,
-        "narHash": "sha256-znGkjGugajqF/sFS+H4+ENmGTaVPFE0uu1JjQZJLEaQ=",
-        "owner": "nixos",
+        "lastModified": 1652059086,
+        "narHash": "sha256-CjHSbr6LSFkN4YBdTB6+8ZQmSqhsbiXqAeQ9hQJ/gBI=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ff691ed9ba21528c1b4e034f36a04027e4522c58",
+        "rev": "934e076a441e318897aa17540f6cf7caadc69028",
         "type": "github"
       },
       "original": {
-        "owner": "nixos",
+        "owner": "NixOS",
         "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
@@ -5902,6 +5960,38 @@
         "type": "github"
       }
     },
+    "nixpkgs_70": {
+      "locked": {
+        "lastModified": 1650469885,
+        "narHash": "sha256-BuILRZ6pzMnGey8/irbjGq1oo3vIvZa1pitSdZCmIXA=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "df78cc4e2a46fca75d14508a5d2ed3494add28ff",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_71": {
+      "locked": {
+        "lastModified": 1652632955,
+        "narHash": "sha256-cSxiAaS8ozw63rLJHdN6RPwhA4lY2XeC/J+uggodYXw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "34e4df55664c24df350f59adba8c7a042dece61e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_8": {
       "locked": {
         "lastModified": 1602702596,
@@ -6723,11 +6813,11 @@
         "utils": "utils_26"
       },
       "locked": {
-        "lastModified": 1652474186,
-        "narHash": "sha256-PILVEX1e4ze0gxK60TDuX+E/umnwelHir/83dfXmTTU=",
+        "lastModified": 1652706109,
+        "narHash": "sha256-k5Z1frtMSKdFGQ1fGYu9nHUc/64O1mYBUYpQdOq7aWc=",
         "owner": "input-output-hk",
         "repo": "spongix",
-        "rev": "a08bcc8f0bb63e372bf82abe5ad1f001e6b4d566",
+        "rev": "df995cc9ac15a282044fe2a00244a595093b6f97",
         "type": "github"
       },
       "original": {
@@ -6859,15 +6949,36 @@
     "std_3": {
       "inputs": {
         "devshell": "devshell_18",
-        "nixpkgs": "nixpkgs_69",
+        "kroki-preprocessor": "kroki-preprocessor",
+        "nixpkgs": "nixpkgs_71",
+        "yants": "yants_8"
+      },
+      "locked": {
+        "lastModified": 1655841593,
+        "narHash": "sha256-2hzkbvhndv53NSpH7snpn/M1zOYx4k7rwz3Pm4w/UJw=",
+        "owner": "divnix",
+        "repo": "std",
+        "rev": "3be03536b3a6767b5542fa14339fc34f5ea22ee7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "divnix",
+        "repo": "std",
+        "type": "github"
+      }
+    },
+    "std_4": {
+      "inputs": {
+        "devshell": "devshell_19",
+        "nixpkgs": "nixpkgs_70",
         "yants": "yants_7"
       },
       "locked": {
-        "lastModified": 1652784712,
-        "narHash": "sha256-ofwGapSWqzUVgIxwwmjlrOVogfjV4yd6WpY8fNfMc2o=",
+        "lastModified": 1651690129,
+        "narHash": "sha256-M3zYXGhio1uOoA9vudLlNOHI2pKyA4Zlfy1ZiGoShto=",
         "owner": "divnix",
         "repo": "std",
-        "rev": "3667d2d868352b0bf47c83440da48bee9f2fab47",
+        "rev": "a65cbc4adddc95118331e178a3f3b88f03a0b50b",
         "type": "github"
       },
       "original": {
@@ -7824,6 +7935,29 @@
       }
     },
     "yants_7": {
+      "inputs": {
+        "nixpkgs": [
+          "std",
+          "kroki-preprocessor",
+          "std",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1645126146,
+        "narHash": "sha256-XQ1eg4gzXoc7Tl8iXak1uCt3KnsTyxqPtLE+vOoDnrQ=",
+        "owner": "divnix",
+        "repo": "yants",
+        "rev": "77df2be1b3cce9f571c6cf451f786b266a6869cc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "divnix",
+        "repo": "yants",
+        "type": "github"
+      }
+    },
+    "yants_8": {
       "inputs": {
         "nixpkgs": [
           "std",