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
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