fix: vendor per-kind sites in the hub; drop stale blog docs

- collect.py: when a kind points at the shared site root, copy only the
  per-kind subdir (site/lib -> <repo>/lib) instead of the whole site, so
  stray single-site build output never leaks into the hub
- Purge stale collected artifacts (404.html, assets/, search/, sitemaps,
  objects.inv, duplicate mcp/) from every repo dir, matching the cleaned
  source site/ roots
- Refresh collected output from source repos, incl. the khata-app app
- Remove the vendored Blog API docs (config.yml entry + blog/) and its card

openapi-first/mcp/modules/openapi_first.templates.model_app.data.json

@@ -1,65 +0,0 @@
-{
-  "module": "openapi_first.templates.model_app.data",
-  "content": {
-    "path": "openapi_first.templates.model_app.data",
-    "docstring": "In-memory data store using Pydantic models.\n\nThis module is NOT thread-safe and is intended for demos and scaffolds only.\nThis module provides a minimal, process-local data store for the\nmodel-based CRUD example application. It stores and returns domain\nobjects defined using Pydantic models and is intended solely for\ndemonstration and scaffolding purposes.\n\nThe implementation intentionally avoids:\n- persistence\n- concurrency guarantees\n- transactional semantics\n- validation beyond what Pydantic provides\n\nIt is not part of the ``openapi_first`` library API surface.",
-    "objects": {
-      "Dict": {
-        "name": "Dict",
-        "kind": "alias",
-        "path": "openapi_first.templates.model_app.data.Dict",
-        "signature": "<bound method Alias.signature of Alias('Dict', 'typing.Dict')>",
-        "docstring": null
-      },
-      "Item": {
-        "name": "Item",
-        "kind": "alias",
-        "path": "openapi_first.templates.model_app.data.Item",
-        "signature": "<bound method Alias.signature of Alias('Item', 'models.Item')>",
-        "docstring": null
-      },
-      "ItemCreate": {
-        "name": "ItemCreate",
-        "kind": "alias",
-        "path": "openapi_first.templates.model_app.data.ItemCreate",
-        "signature": "<bound method Alias.signature of Alias('ItemCreate', 'models.ItemCreate')>",
-        "docstring": null
-      },
-      "list_items": {
-        "name": "list_items",
-        "kind": "function",
-        "path": "openapi_first.templates.model_app.data.list_items",
-        "signature": "<bound method Function.signature of Function('list_items', 34, 43)>",
-        "docstring": "Return all items in the data store.\n\nReturns\n-------\nlist[Item]\n    A list of item domain objects."
-      },
-      "get_item": {
-        "name": "get_item",
-        "kind": "function",
-        "path": "openapi_first.templates.model_app.data.get_item",
-        "signature": "<bound method Function.signature of Function('get_item', 46, 65)>",
-        "docstring": "Retrieve a single item by ID.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to retrieve.\n\nReturns\n-------\nItem\n    The requested item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
-      },
-      "create_item": {
-        "name": "create_item",
-        "kind": "function",
-        "path": "openapi_first.templates.model_app.data.create_item",
-        "signature": "<bound method Function.signature of Function('create_item', 68, 89)>",
-        "docstring": "Create a new item in the data store.\n\nA new identifier is assigned automatically. No additional validation\nis performed beyond Pydantic model validation.\n\nParameters\n----------\npayload : ItemCreate\n    Data required to create a new item.\n\nReturns\n-------\nItem\n    The newly created item."
-      },
-      "update_item": {
-        "name": "update_item",
-        "kind": "function",
-        "path": "openapi_first.templates.model_app.data.update_item",
-        "signature": "<bound method Function.signature of Function('update_item', 92, 120)>",
-        "docstring": "Replace an existing item in the data store.\n\nThis function performs a full replacement of the stored item.\nPartial updates are not supported.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to update.\npayload : ItemCreate\n    New item data.\n\nReturns\n-------\nItem\n    The updated item.\n\nRaises\n------\nKeyError\n    If the item does not exist."
-      },
-      "delete_item": {
-        "name": "delete_item",
-        "kind": "function",
-        "path": "openapi_first.templates.model_app.data.delete_item",
-        "signature": "<bound method Function.signature of Function('delete_item', 123, 137)>",
-        "docstring": "Remove an item from the data store.\n\nParameters\n----------\nitem_id : int\n    Identifier of the item to delete.\n\nRaises\n------\nKeyError\n    If the item does not exist."
-      }
-    }
-  }
-}