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/bulk-delete-charts.api.mdx

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