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/nav.json

@@ -1,130 +0,0 @@
-[
-  {
-    "module": "openapi_first",
-    "resource": "doc://modules/openapi_first"
-  },
-  {
-    "module": "openapi_first.app",
-    "resource": "doc://modules/openapi_first.app"
-  },
-  {
-    "module": "openapi_first.binder",
-    "resource": "doc://modules/openapi_first.binder"
-  },
-  {
-    "module": "openapi_first.cli",
-    "resource": "doc://modules/openapi_first.cli"
-  },
-  {
-    "module": "openapi_first.client",
-    "resource": "doc://modules/openapi_first.client"
-  },
-  {
-    "module": "openapi_first.codegen",
-    "resource": "doc://modules/openapi_first.codegen"
-  },
-  {
-    "module": "openapi_first.codegen_routes",
-    "resource": "doc://modules/openapi_first.codegen_routes"
-  },
-  {
-    "module": "openapi_first.errors",
-    "resource": "doc://modules/openapi_first.errors"
-  },
-  {
-    "module": "openapi_first.loader",
-    "resource": "doc://modules/openapi_first.loader"
-  },
-  {
-    "module": "openapi_first.security",
-    "resource": "doc://modules/openapi_first.security"
-  },
-  {
-    "module": "openapi_first.templates",
-    "resource": "doc://modules/openapi_first.templates"
-  },
-  {
-    "module": "openapi_first.templates.crud_app",
-    "resource": "doc://modules/openapi_first.templates.crud_app"
-  },
-  {
-    "module": "openapi_first.templates.crud_app.data",
-    "resource": "doc://modules/openapi_first.templates.crud_app.data"
-  },
-  {
-    "module": "openapi_first.templates.crud_app.main",
-    "resource": "doc://modules/openapi_first.templates.crud_app.main"
-  },
-  {
-    "module": "openapi_first.templates.crud_app.routes",
-    "resource": "doc://modules/openapi_first.templates.crud_app.routes"
-  },
-  {
-    "module": "openapi_first.templates.crud_app.test_crud_app",
-    "resource": "doc://modules/openapi_first.templates.crud_app.test_crud_app"
-  },
-  {
-    "module": "openapi_first.templates.health_app",
-    "resource": "doc://modules/openapi_first.templates.health_app"
-  },
-  {
-    "module": "openapi_first.templates.health_app.main",
-    "resource": "doc://modules/openapi_first.templates.health_app.main"
-  },
-  {
-    "module": "openapi_first.templates.health_app.routes",
-    "resource": "doc://modules/openapi_first.templates.health_app.routes"
-  },
-  {
-    "module": "openapi_first.templates.model_app",
-    "resource": "doc://modules/openapi_first.templates.model_app"
-  },
-  {
-    "module": "openapi_first.templates.model_app.data",
-    "resource": "doc://modules/openapi_first.templates.model_app.data"
-  },
-  {
-    "module": "openapi_first.templates.model_app.main",
-    "resource": "doc://modules/openapi_first.templates.model_app.main"
-  },
-  {
-    "module": "openapi_first.templates.model_app.models",
-    "resource": "doc://modules/openapi_first.templates.model_app.models"
-  },
-  {
-    "module": "openapi_first.templates.model_app.routes",
-    "resource": "doc://modules/openapi_first.templates.model_app.routes"
-  },
-  {
-    "module": "openapi_first.templates.model_app.test_model_app",
-    "resource": "doc://modules/openapi_first.templates.model_app.test_model_app"
-  },
-  {
-    "module": "openapi_first.templates.vet_app",
-    "resource": "doc://modules/openapi_first.templates.vet_app"
-  },
-  {
-    "module": "openapi_first.templates.vet_app.data",
-    "resource": "doc://modules/openapi_first.templates.vet_app.data"
-  },
-  {
-    "module": "openapi_first.templates.vet_app.main",
-    "resource": "doc://modules/openapi_first.templates.vet_app.main"
-  },
-  {
-    "module": "openapi_first.templates.vet_app.models",
-    "resource": "doc://modules/openapi_first.templates.vet_app.models"
-  },
-  {
-    "module": "openapi_first.templates.vet_app.routes",
-    "resource": "doc://modules/openapi_first.templates.vet_app.routes"
-  },
-  {
-    "module": "openapi_first.templates.vet_app.sse",
-    "resource": "doc://modules/openapi_first.templates.vet_app.sse"
-  },
-  {
-    "module": "openapi_first.templates.vet_app.test_vet_app",
-    "resource": "doc://modules/openapi_first.templates.vet_app.test_vet_app"
-  }
-]