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

omniread/mcp/modules/omniread.pdf.client.json

@@ -1,69 +0,0 @@
-{
-  "module": "omniread.pdf.client",
-  "content": {
-    "path": "omniread.pdf.client",
-    "docstring": "# Summary\n\nPDF client abstractions for OmniRead.\n\nThis module defines the **client layer** responsible for retrieving raw PDF\nbytes from a concrete backing store.\n\nClients provide low-level access to PDF binaries and are intentionally\ndecoupled from scraping and parsing logic. They do not perform validation,\ninterpretation, or content extraction.\n\nTypical backing stores include:\n\n- Local filesystems\n- Object storage (S3, GCS, etc.)\n- Network file systems",
-    "objects": {
-      "ABC": {
-        "name": "ABC",
-        "kind": "alias",
-        "path": "omniread.pdf.client.ABC",
-        "signature": "<bound method Alias.signature of Alias('ABC', 'abc.ABC')>",
-        "docstring": null
-      },
-      "abstractmethod": {
-        "name": "abstractmethod",
-        "kind": "alias",
-        "path": "omniread.pdf.client.abstractmethod",
-        "signature": "<bound method Alias.signature of Alias('abstractmethod', 'abc.abstractmethod')>",
-        "docstring": null
-      },
-      "Path": {
-        "name": "Path",
-        "kind": "alias",
-        "path": "omniread.pdf.client.Path",
-        "signature": "<bound method Alias.signature of Alias('Path', 'pathlib.Path')>",
-        "docstring": null
-      },
-      "Any": {
-        "name": "Any",
-        "kind": "alias",
-        "path": "omniread.pdf.client.Any",
-        "signature": "<bound method Alias.signature of Alias('Any', 'typing.Any')>",
-        "docstring": null
-      },
-      "BasePDFClient": {
-        "name": "BasePDFClient",
-        "kind": "class",
-        "path": "omniread.pdf.client.BasePDFClient",
-        "signature": "<bound method Class.signature of Class('BasePDFClient', 25, 57)>",
-        "docstring": "Abstract client responsible for retrieving PDF bytes.\n\nRetrieves bytes from a specific backing store (filesystem, S3, FTP, etc.).\n\nNotes:\n    **Responsibilities:**\n\n        - Implementations must accept a source identifier appropriate to\n          the backing store.\n        - Return the full PDF binary payload.\n        - Raise retrieval-specific errors on failure.",
-        "members": {
-          "fetch": {
-            "name": "fetch",
-            "kind": "function",
-            "path": "omniread.pdf.client.BasePDFClient.fetch",
-            "signature": "<bound method Function.signature of Function('fetch', 40, 57)>",
-            "docstring": "Fetch raw PDF bytes from the given source.\n\nArgs:\n    source (Any):\n        Identifier of the PDF location, such as a file path, object storage key, or remote reference.\n\nReturns:\n    bytes:\n        Raw PDF bytes.\n\nRaises:\n    Exception:\n        Retrieval-specific errors defined by the implementation."
-          }
-        }
-      },
-      "FileSystemPDFClient": {
-        "name": "FileSystemPDFClient",
-        "kind": "class",
-        "path": "omniread.pdf.client.FileSystemPDFClient",
-        "signature": "<bound method Class.signature of Class('FileSystemPDFClient', 60, 96)>",
-        "docstring": "PDF client that reads from the local filesystem.\n\nNotes:\n    **Guarantees:**\n\n        - This client reads PDF files directly from the disk and returns\n          their raw binary contents.",
-        "members": {
-          "fetch": {
-            "name": "fetch",
-            "kind": "function",
-            "path": "omniread.pdf.client.FileSystemPDFClient.fetch",
-            "signature": "<bound method Function.signature of Function('fetch', 71, 96)>",
-            "docstring": "Read a PDF file from the local filesystem.\n\nArgs:\n    path (Path):\n        Filesystem path to the PDF file.\n\nReturns:\n    bytes:\n        Raw PDF bytes.\n\nRaises:\n    FileNotFoundError:\n        If the path does not exist.\n    ValueError:\n        If the path exists but is not a file."
-          }
-        }
-      }
-    }
-  }
-}