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-new-chart.api.mdx

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