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

mail-intake/mcp/nav.json

@@ -1,90 +0,0 @@
-[
-  {
-    "module": "mail_intake",
-    "resource": "doc://modules/mail_intake"
-  },
-  {
-    "module": "mail_intake.adapters",
-    "resource": "doc://modules/mail_intake.adapters"
-  },
-  {
-    "module": "mail_intake.adapters.base",
-    "resource": "doc://modules/mail_intake.adapters.base"
-  },
-  {
-    "module": "mail_intake.adapters.gmail",
-    "resource": "doc://modules/mail_intake.adapters.gmail"
-  },
-  {
-    "module": "mail_intake.auth",
-    "resource": "doc://modules/mail_intake.auth"
-  },
-  {
-    "module": "mail_intake.auth.base",
-    "resource": "doc://modules/mail_intake.auth.base"
-  },
-  {
-    "module": "mail_intake.auth.google",
-    "resource": "doc://modules/mail_intake.auth.google"
-  },
-  {
-    "module": "mail_intake.config",
-    "resource": "doc://modules/mail_intake.config"
-  },
-  {
-    "module": "mail_intake.credentials",
-    "resource": "doc://modules/mail_intake.credentials"
-  },
-  {
-    "module": "mail_intake.credentials.pickle",
-    "resource": "doc://modules/mail_intake.credentials.pickle"
-  },
-  {
-    "module": "mail_intake.credentials.redis",
-    "resource": "doc://modules/mail_intake.credentials.redis"
-  },
-  {
-    "module": "mail_intake.credentials.store",
-    "resource": "doc://modules/mail_intake.credentials.store"
-  },
-  {
-    "module": "mail_intake.exceptions",
-    "resource": "doc://modules/mail_intake.exceptions"
-  },
-  {
-    "module": "mail_intake.ingestion",
-    "resource": "doc://modules/mail_intake.ingestion"
-  },
-  {
-    "module": "mail_intake.ingestion.reader",
-    "resource": "doc://modules/mail_intake.ingestion.reader"
-  },
-  {
-    "module": "mail_intake.models",
-    "resource": "doc://modules/mail_intake.models"
-  },
-  {
-    "module": "mail_intake.models.message",
-    "resource": "doc://modules/mail_intake.models.message"
-  },
-  {
-    "module": "mail_intake.models.thread",
-    "resource": "doc://modules/mail_intake.models.thread"
-  },
-  {
-    "module": "mail_intake.parsers",
-    "resource": "doc://modules/mail_intake.parsers"
-  },
-  {
-    "module": "mail_intake.parsers.body",
-    "resource": "doc://modules/mail_intake.parsers.body"
-  },
-  {
-    "module": "mail_intake.parsers.headers",
-    "resource": "doc://modules/mail_intake.parsers.headers"
-  },
-  {
-    "module": "mail_intake.parsers.subject",
-    "resource": "doc://modules/mail_intake.parsers.subject"
-  }
-]