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-a-dashboard.api.mdx

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