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-dataset.api.mdx

@@ -0,0 +1,68 @@
+---
+id: delete-a-dataset
+title: "Delete a dataset"
+description: "Delete a dataset"
+sidebar_label: "Delete a dataset"
+hide_title: true
+hide_table_of_contents: true
+api: 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
+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 dataset"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"delete"}
+  path={"/api/v1/dataset/{pk}"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Delete a dataset
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./delete-a-dataset.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./delete-a-dataset.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./delete-a-dataset.StatusCodes.json")}
+>
+
+</StatusCodes>