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/create-a-saved-query.api.mdx

@@ -0,0 +1,66 @@
+---
+id: create-a-saved-query
+title: "Create a saved query"
+description: "Create a saved query"
+sidebar_label: "Create a saved query"
+hide_title: true
+hide_table_of_contents: true
+api: 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
+sidebar_class_name: "post 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={"Create a saved query"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"post"}
+  path={"/api/v1/saved_query/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Create a saved query
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./create-a-saved-query.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./create-a-saved-query.StatusCodes.json")}
+>
+
+</StatusCodes>