Update to new OpenZeppelin docs generation

docs/config-md.js

@@ -0,0 +1,20 @@
+const path = require('path');
+const fs = require('fs');
+
+/** @type import('solidity-docgen/dist/config').UserConfig */
+module.exports = {
+  outputDir: 'docs/modules/api/pages',
+  templates: 'docs/templates-md',
+  exclude: ['mocks'],
+  pageExtension: '.mdx',
+  pages: (_, file, config) => {
+    const sourcesDir = path.resolve(config.root, config.sourcesDir);
+    let dir = path.resolve(config.root, file.absolutePath);
+    while (dir.startsWith(sourcesDir)) {
+      dir = path.dirname(dir);
+      if (fs.existsSync(path.join(dir, 'README.adoc'))) {
+        return path.relative(sourcesDir, dir) + config.pageExtension;
+      }
+    }
+  },
+};

docs/modules/ROOT/nav.adoc

@@ -1,5 +1 @@
-* xref:index.adoc[Overview]
-* xref:base.adoc[Base]
-* xref:fee.adoc[Fee]
-* xref:oracles.adoc[Oracles]
-* xref:utilities.adoc[Utilities]
+* xref:index.adoc[Overview]

docs/modules/api/nav.adoc

@@ -1,7 +1 @@
 .API
-* xref:base.adoc[Base]
-* xref:fee.adoc[Fee]
-* xref:general.adoc[General]
-* xref:interfaces.adoc[Interfaces]
-* xref:oracles.adoc[Oracles]
-* xref:utils.adoc[Utils]