feat: list each declared doc kind as its own homepage card

- compute per-kind home URLs (lib/, api/, wiki/) via _find_home_for_kind
- emit one card per declared kind so multi-kind repos (e.g. doc-forge
  with lib + wiki) appear in each matching homepage section
- declare the doc-forge wiki kind and refresh its vendored site with the
  combined lib + wiki build

doc-forge/mcp/modules/docforge.nav.resolver.json

@@ -30,7 +30,7 @@
         "kind": "class",
         "path": "docforge.nav.resolver.NavSpec",
         "signature": "<bound method Alias.signature of Alias('NavSpec', 'docforge.nav.spec.NavSpec')>",
-        "docstring": "Parsed representation of a navigation specification.\n\nA ``NavSpec`` describes the intended documentation navigation layout before\nit is resolved against the filesystem.\n\nAttributes:\n    home: Relative path to the documentation home page (for example\n        ``index.md``).\n    groups: Mapping of navigation group titles to lists of file patterns\n        or glob expressions.",
+        "docstring": "Parsed representation of a navigation specification.\n\nA ``NavSpec`` describes the intended documentation navigation layout before\nit is resolved against the filesystem.\n\nAttributes:\n    home: Relative path to the documentation home page (for example\n        ``index.md``).\n    groups: Mapping of navigation group titles to lists of file patterns\n        or glob expressions.\n    icon: Optional mapping of theme icon entries (for example\n        ``{\"logo\": \"material/code-tags\"}``) injected into the MkDocs\n        theme as ``theme.icon``.",
         "members": {
           "home": {
             "name": "home",
@@ -46,6 +46,13 @@
             "signature": "<bound method Alias.signature of Alias('groups', 'docforge.nav.spec.NavSpec.groups')>",
             "docstring": null
           },
+          "icon": {
+            "name": "icon",
+            "kind": "attribute",
+            "path": "docforge.nav.resolver.NavSpec.icon",
+            "signature": "<bound method Alias.signature of Alias('icon', 'docforge.nav.spec.NavSpec.icon')>",
+            "docstring": null
+          },
           "load": {
             "name": "load",
             "kind": "function",