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

hexa/mcp/modules/hexa.container.json

@@ -1,58 +0,0 @@
-{
-  "module": "hexa.container",
-  "content": {
-    "path": "hexa.container",
-    "docstring": "Container to build a wired hexa pipeline from annotations.",
-    "objects": {
-      "annotations": {
-        "name": "annotations",
-        "kind": "alias",
-        "path": "hexa.container.annotations",
-        "signature": "<bound method Alias.signature of Alias('annotations', '__future__.annotations')>",
-        "docstring": null
-      },
-      "inspect": {
-        "name": "inspect",
-        "kind": "alias",
-        "path": "hexa.container.inspect",
-        "signature": "<bound method Alias.signature of Alias('inspect', 'inspect')>",
-        "docstring": null
-      },
-      "UnionType": {
-        "name": "UnionType",
-        "kind": "alias",
-        "path": "hexa.container.UnionType",
-        "signature": "<bound method Alias.signature of Alias('UnionType', 'types.UnionType')>",
-        "docstring": null
-      },
-      "Any": {
-        "name": "Any",
-        "kind": "alias",
-        "path": "hexa.container.Any",
-        "signature": "<bound method Alias.signature of Alias('Any', 'typing.Any')>",
-        "docstring": null
-      },
-      "TypeVar": {
-        "name": "TypeVar",
-        "kind": "alias",
-        "path": "hexa.container.TypeVar",
-        "signature": "<bound method Alias.signature of Alias('TypeVar', 'typing.TypeVar')>",
-        "docstring": null
-      },
-      "T": {
-        "name": "T",
-        "kind": "attribute",
-        "path": "hexa.container.T",
-        "signature": null,
-        "docstring": null
-      },
-      "build": {
-        "name": "build",
-        "kind": "function",
-        "path": "hexa.container.build",
-        "signature": "<bound method Function.signature of Function('build', 12, 97)>",
-        "docstring": "Recursively instantiate the port tree from annotations.\n\nParameters\n----------\ncls : type\n    The root class to build (e.g. ``AxisExtractionPipeline``).\ninstances : dict, optional\n    ``{slot_name: object}`` injected verbatim into every node whose\n    annotations contain that name (runtime values — repos, handlers,\n    clients — that must not be re-constructed). Applied to the whole\n    tree by name.\nconfig : dict, optional\n    ``{field_name: value}`` propagated by name to every node's annotated\n    config fields (non-port attributes), replacing the default ``None``.\n\nReturns\n-------\ninstance\n    A fully wired instance of ``cls`` and all its nested ports."
-      }
-    }
-  }
-}