Use new base url for thunderstore client

src/thunderstore/client.cr

@@ -2,6 +2,8 @@ module Thunderstore
   class Client
     property community = ""
 
+    BASE_URL = "https://thunderstore.io"
+
     def initialize(@community : String = "")
     end
 
@@ -14,9 +16,9 @@ module Thunderstore
 
     # Returns the base url for which this client will make API requests to.
     def base_url : URI
-      return URI.parse("https://thunderstore.io") if community.empty?
+      return URI.parse(BASE_URL) if community.empty?
 
-      URI.parse("https://#{community}.thunderstore.io")
+      URI.parse("#{BASE_URL}/c/#{community}")
     end
 
     # Initializes an `HTTP::Client` for the configured `base_url`, and executes a GET request on the specified `path`.