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-security-users-by-pk.api.mdx

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