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-an-rls.api.mdx

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