Add clanServices to docs

Renders the documentation for clanServices. Options for the modules are
extracted and rendered the same way as for the existing clanModules.

Additionally tweaks the typography for the documentation of options
slightly

docs/nix/get-module-docs.nix

@@ -36,6 +36,33 @@
     ) rolesOptions
   ) modulesRolesOptions;
 
+  # Test with:
+  # nix build .\#legacyPackages.x86_64-linux.clanModulesViaService
+  clanModulesViaService = lib.mapAttrs (
+    _moduleName: moduleValue:
+    let
+      evaluatedService = clan-core.clanLib.inventory.evalClanService {
+        modules = [ moduleValue ];
+        prefix = [ ];
+      };
+    in
+    {
+      roles = lib.mapAttrs (
+        _roleName: role:
+
+        (nixosOptionsDoc {
+          transformOptions =
+            opt: if lib.strings.hasPrefix "_" opt.name then opt // { visible = false; } else opt;
+          options = (lib.evalModules { modules = [ role.interface ]; }).options;
+          warningsAreErrors = true;
+        }).optionsJSON
+      ) evaluatedService.config.roles;
+
+      manifest = evaluatedService.config.manifest;
+
+    }
+  ) clan-core.clan.modules;
+
   clanCore =
     (nixosOptionsDoc {
       options =