feat: serve docs flat at /<repo>/ with no redirects

- collect.py copies each repo's built site contents directly to a
  top-level <repo>/ dir (was libs|apis|wiki/<repo>/site nesting)
- nginx uses `index index.html lib/index.html api/index.html` so
  /dagpipe/ -> lib/index.html, /auth-server/ -> api/index.html are
  served internally with no redirects
- _index regenerates links against the flat layout
  (/dagpipe/lib/, /auth-server/api/, /mongo-ops/, /blog/...)
- config.yml static entries point at vendored blog/ + media-manager/
- Dockerfile copies per-repo dirs flat into the nginx html root
- removed stale libs/, apis/, wiki/, tutorials/ category trees

doc-forge/mcp/modules/docforge.cli.main.json

@@ -0,0 +1,23 @@
+{
+  "module": "docforge.cli.main",
+  "content": {
+    "path": "docforge.cli.main",
+    "docstring": "# Summary\n\nCommand-line entry point for the doc-forge CLI.\n\nThis module exposes the executable entry point that initializes the\nClick command group defined in `docforge.cli.commands`.",
+    "objects": {
+      "cli": {
+        "name": "cli",
+        "kind": "attribute",
+        "path": "docforge.cli.main.cli",
+        "signature": "<bound method Alias.signature of Alias('cli', 'docforge.cli.commands.cli')>",
+        "docstring": null
+      },
+      "main": {
+        "name": "main",
+        "kind": "function",
+        "path": "docforge.cli.main.main",
+        "signature": "<bound method Function.signature of Function('main', 13, 21)>",
+        "docstring": "Run the doc-forge command-line interface.\n\nThis function initializes and executes the Click CLI application.\nIt is used as the console entry point when invoking `doc-forge`\nfrom the command line."
+      }
+    }
+  }
+}