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

hexa/mcp/modules/hexa.container.json

@@ -0,0 +1,58 @@
+{
+  "module": "hexa.container",
+  "content": {
+    "path": "hexa.container",
+    "docstring": "Container to build a wired hexa pipeline from annotations.",
+    "objects": {
+      "annotations": {
+        "name": "annotations",
+        "kind": "alias",
+        "path": "hexa.container.annotations",
+        "signature": "<bound method Alias.signature of Alias('annotations', '__future__.annotations')>",
+        "docstring": null
+      },
+      "inspect": {
+        "name": "inspect",
+        "kind": "alias",
+        "path": "hexa.container.inspect",
+        "signature": "<bound method Alias.signature of Alias('inspect', 'inspect')>",
+        "docstring": null
+      },
+      "UnionType": {
+        "name": "UnionType",
+        "kind": "alias",
+        "path": "hexa.container.UnionType",
+        "signature": "<bound method Alias.signature of Alias('UnionType', 'types.UnionType')>",
+        "docstring": null
+      },
+      "Any": {
+        "name": "Any",
+        "kind": "alias",
+        "path": "hexa.container.Any",
+        "signature": "<bound method Alias.signature of Alias('Any', 'typing.Any')>",
+        "docstring": null
+      },
+      "TypeVar": {
+        "name": "TypeVar",
+        "kind": "alias",
+        "path": "hexa.container.TypeVar",
+        "signature": "<bound method Alias.signature of Alias('TypeVar', 'typing.TypeVar')>",
+        "docstring": null
+      },
+      "T": {
+        "name": "T",
+        "kind": "attribute",
+        "path": "hexa.container.T",
+        "signature": null,
+        "docstring": null
+      },
+      "build": {
+        "name": "build",
+        "kind": "function",
+        "path": "hexa.container.build",
+        "signature": "<bound method Function.signature of Function('build', 12, 97)>",
+        "docstring": "Recursively instantiate the port tree from annotations.\n\nParameters\n----------\ncls : type\n    The root class to build (e.g. ``AxisExtractionPipeline``).\ninstances : dict, optional\n    ``{slot_name: object}`` injected verbatim into every node whose\n    annotations contain that name (runtime values — repos, handlers,\n    clients — that must not be re-constructed). Applied to the whole\n    tree by name.\nconfig : dict, optional\n    ``{field_name: value}`` propagated by name to every node's annotated\n    config fields (non-port attributes), replacing the default ``None``.\n\nReturns\n-------\ninstance\n    A fully wired instance of ``cls`` and all its nested ports."
+      }
+    }
+  }
+}