docs: cut 6.1.0 versions for user_docs, admin_docs, developer_docs, components

Snapshots all four versioned Docusaurus sections at v6.1.0, cut from
master after the version-cutting tooling (#39837), broken-internal-
links fix (#40102), and user_docs rename (#40171) all landed. With
the rename in place, all four sections now produce parallel-named
files at the docs/ root (no more bare `versioned_docs/` outlier).

Versioning behavior: lastVersion stays at current for every section,
so the canonical URLs (/user-docs/..., /admin-docs/...,
/developer-docs/..., /components/...) continue to render content
from master. The current version is consistently labeled "Next"
with an unreleased banner, and 6.1.0 is a historical pin accessible
only via its explicit version segment.

Component playground: previously disabled: true in versions-config.json,
now enabled and versioned.

Snapshot includes:
- All MDX content for the four sections.
- Auto-gen captured fresh: 74 database pages (engine spec metadata),
  ~1,800 API reference files (openapi.json), 59 component pages
  (Storybook stories).
- Data imports frozen at cut time into snapshot-local _versioned_data/
  dirs:
    user_docs_versioned_docs/version-6.1.0/_versioned_data/src/data/databases.json
      (canonical 80-database diagnostics from master, preserved by the
      generator's input-hash cache)
    admin_docs_versioned_docs/version-6.1.0/_versioned_data/data/countries.json
    admin_docs_versioned_docs/version-6.1.0/_versioned_data/static/feature-flags.json
    developer_docs_versioned_docs/version-6.1.0/_versioned_data/static/data/components.json
- Import paths in deeply-nested files rewritten so they still resolve
  from one directory deeper inside the snapshot.
- developer_docs/extensions/overview.md snapshot has the FIXED
  ./mcp.md form (from #40102), so the SPA-nav 404 isn't baked into
  the 6.1.0 version.

Verified via full yarn build: exit 0, no broken links surfaced by
onBrokenLinks: throw.

docs/developer_docs_versioned_docs/version-6.1.0/api/delete-a-form-data.api.mdx

@@ -0,0 +1,68 @@
+---
+id: delete-a-form-data
+title: "Delete a form_data"
+description: "Delete a form_data"
+sidebar_label: "Delete a form_data"
+hide_title: true
+hide_table_of_contents: true
+api: eJzFV1Fv2zYQ/ivEYQ8JpsRJ0AGBij6kiYumC7qgdtYCkZEy0jlSQpEqeXLtCfrvw5Gy7NgeBmQD8iSJ5B3vu/v48dRAJa0skdA6iG8byNCltqioMBpiGOcopsaWd5kkKZ5wcQgRFDxTScohAi1LhBiecAERWPxRFxYziMnWGIFLcywlxA3QouJljmyhH6BtJ7zYVUY7dDx/cnTEj9RoQk38KqtKFankOAaPjoNp1vxV1lRoqQjWJTonH5Bft8O36GpFwkwF5SjYzDuFaCuofsTcP2JK0EaAc1lWCp9tsjJoo439LlAhYeZ3cmQsZqvsHbK/N/8XzpfG/l5mgsuEjmJxqWdSFZlYUUBU1syKDLNd6NZsA5bj18Vyo2VNubHFX5jF4qymHDV1+4ueizuArBsGJG9eF8lnQ2Jqap3FIlDWJxk53c7UNkWRGXRCGxI4Lzj926B6Hx7Ryclr16ayJuXPe4WC60KLWPzJdAv1QWuN3YXj3NQq81A7D501b/Xbax+fS01otVTCoZ2hDShicaZFrXFeYcpF84PCpGlt/4GAHyRJ1acgAodpbRkjK/DjT4L4dsIaSfKBVRmG80oZi+KDsaW4kCRhEsH8IDUZjnyUQbuV1A8QQ3rz5QoiUPIe1eozEIm/a6vEwTdxMbwajocigZyoigcDZVKpcuMoPj06PR3IqhjMjgcYth70OjZonnDRJiCSJNFCHHwUCZx1x8nXIRbvUVq04pez8/PhaHQ3/uP34ecEoI36EK8XlHsNXgbZD/RhFmVlLC3Pgkt0opdXhnjXDx9mXnL3OBTxYixRMM9RZmjdu2YDUQKxSKBDlYD4VciUmXlH5gl1m+j9RFe20LS3jPDQkaTa3XGF9teBf5IzOfJMWAP/bHBVJ6Md4+8xy5+yIDFFSnOP9z+hbQLkEik3GcMLdNjMRbxcKDbLzEn5vqx0ExIy9vn4HixafnBy3iaasRiFh8o8bOZo/y0w1XddpEKurk+IIMQKMYSaQxSakBj+BTEn1R/XcEpqyznfmTrYjOOKp0WGM1SmKlFTd/B9SYOjprKGTGpUGw8GDbtq44ap2255O68dmXLpIoKZtAXro+u0yrsJXcxU1oq6MCEC1HXJQtB98sPBVtY+jsfXovfTRsDRPPfX490KbhQUjee4qRPGistrdsJYnjvZmarO3q9ufYe3VLUR63EA6bWtgXtPG1Yzyf4+fR1D1y0y8cPsqkHzoNuIje8sTi26/KVOWu5ep2a7UxzVFVqHnBYqiGV/fYi5E9bNjkNKHJXSXzZdA7yTsM+26C8dwjkNKiULza48iZqOybcgq4L3O+aaBzZDBOs+Y261J8vS3kLT3EuHN1a1LQ//qNHyNTJZsSu09YW/iTOIp1I53Iqtv1Jh70vXOe2Lnd3/ThTdoNQLT2tV8xdE/r8g/B20E+ajFxUfUJg5S1P0qre02brPmUj9wQ8aBRFw/7aW0r7Y3QtvsDOkpgkrglC1fYReyDnGtv0bHDaEQw==
+sidebar_class_name: "delete api-method"
+info_path: developer-docs/api/superset
+custom_edit_url: null
+hide_send_button: true
+show_extensions: true
+---
+
+import MethodEndpoint from "@theme/ApiExplorer/MethodEndpoint";
+import ParamsDetails from "@theme/ParamsDetails";
+import RequestSchema from "@theme/RequestSchema";
+import StatusCodes from "@theme/StatusCodes";
+import OperationTabs from "@theme/OperationTabs";
+import TabItem from "@theme/TabItem";
+import Heading from "@theme/Heading";
+import Translate from "@docusaurus/Translate";
+
+<Heading
+  as={"h1"}
+  className={"openapi__heading"}
+  children={"Delete a form_data"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"delete"}
+  path={"/api/v1/explore/form_data/{key}"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Delete a form_data
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./delete-a-form-data.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./delete-a-form-data.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./delete-a-form-data.StatusCodes.json")}
+>
+
+</StatusCodes>