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-security-refresh.api.mdx

@@ -0,0 +1,58 @@
+---
+id: create-security-refresh
+title: "Create security refresh"
+description: "Use the refresh token to get a new JWT access token"
+sidebar_label: "Create security refresh"
+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 security refresh"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"post"}
+  path={"/api/v1/security/refresh"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Use the refresh token to get a new JWT access token
+
+<ParamsDetails>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./create-security-refresh.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./create-security-refresh.StatusCodes.json")}
+>
+
+</StatusCodes>