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-datasets.api.mdx

@@ -0,0 +1,68 @@
+---
+id: bulk-delete-datasets
+title: "Bulk delete datasets"
+description: "Bulk delete datasets"
+sidebar_label: "Bulk delete datasets"
+hide_title: true
+hide_table_of_contents: true
+api: eJzFV21v2zYQ/ivEYcAaTImTrAMCFf2QpgnaLuiC2dkLosClpYvFRCIV8uQmE/TfhyMl+SUu0O2LP0mmeM/dc+9uoJJWlkhoHcQ3DaRGE2qCuAFZVYVKJSmjR/fOaD5zaY6l5DdFWDp+oecKIQalCedooY36E2mtfIYISFHBv+dI0wwLJJyqzE07qLZtI1AaYnis0fJ9LUu+/gjtbQQWXWW0Q6/q+PCQH99tY2VNhZZUkC7ROTnHFZsdWaXn0C5tNrN7TIlJ4JMsqwLXBJcCbQQZutSqilVDDO8lSYckZnXxIAJLRnm9a4vfyUxYfKzRUSw+6oUsVCaWMReVNQuVYbaN04ps4HK0Wy7XWtaUG6v+wSwWpzXlqKnT7w1VdjuRVcHA5OfdMrkwdqayDHUs/ja1yIz+kUQuFygqtKVyjhmRETJN0TlBuXLCojO1TXEbwQEvsHu9W3afDYk7U+ssFpMc+xTCbKAgMoNOaEMCnxQn10tGA4ZndHy868yrrOFQyFmBgrOOnmPxBxdTyD601thtPM5MXWSeaofQSbOqX3bdHD5qQqtlIRzaBdrAIhanWtQanypMOWj+UJg0re03yutCkiwGF0TgMK0tc+SBcv+VIL655V5Ocs5Dpu+VDm4jeNpPTYZjb1yYQIXUc4ghvf79EiIo5AyL5c+uBGJIa1uI/b/E+/PL88m5SCAnquLRqDCpLHLjKD45PDkZyUqNFkejLGgcJSCSJNFC7H8QCZx2TcH7OxbvUFq04ofTs7Pz8Xg6+e3X888JQBsNNl09U270ilXDwWCXKitjqc95l+hE9yNMvB2OD8KEeMWmiO83Pgr3c5QZWve22aCQQCwS6GgkIH7q+seUzAPqNtF7ia6s0vSqN+nAkaTaTTkGe6tMP8mFHPsQr7BdO1xGwmjHhAeS8qtUJO6Q0twT/G/0msCxRMpNxnxChDfJx/1FsRlI9sKXPpZN8MDEO+BLkGj5wd54k2g23hR4UJj5plP23vgFZGMkLse7yPo0jiBYCzF0kz+CSlIOMWySZMf5Wgu5Xlv261b3wKbqS/4sMlxgYaoSNXVV68MWgJrKGjKpKdp4NGoYqo0bzsf2BdpZ7ciUPUQEC2kVNzfXNRoPw+8Z3sm6oM5MiAB1XXIVdz/54St5Hf/DZHIlBpw2ArZmHW/g+8K4cWhH/I2XQWGs+HjFIMxlHWSrqzp5f7ttOYp9SxpzMw0kfWNqYOYz5cLYUjLepz8nHCN/DeLuKwwN1ZNuIxaeWryz6PL/C+LX3jsT6KxZX1doHdLK6rxyxLkT7i2OgkscldJPim5x/kaOrikZZgbhE42qQiq/Ovg0arrkvQFZKdZ4xNIBCCLgWIdg3kDTzKTDa1u0LR+HDZ4Te0PZMOJg6YV1zQ/47Hd+zsSi5u+++vq09CMkglD8XkMQOE1T9O2ol3oxQRllKM/QSyAC3gdXvDBEqHthBf2/GP28At804UZoKFxWwQ7fYaG9bdv2X7NvmWI=
+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 datasets"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"delete"}
+  path={"/api/v1/dataset/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Bulk delete datasets
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./bulk-delete-datasets.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./bulk-delete-datasets.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./bulk-delete-datasets.StatusCodes.json")}
+>
+
+</StatusCodes>