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-dataset-column.api.mdx

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