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-rls-rule.api.mdx

@@ -0,0 +1,66 @@
+---
+id: create-a-new-rls-rule
+title: "Create a new RLS rule"
+description: "Create a new RLS rule"
+sidebar_label: "Create a new RLS rule"
+hide_title: true
+hide_table_of_contents: true
+api: eJztWG1v2zYQ/isEMaAJpsRx0AKFinxIghZNF7RB7G4DoiClpbPNhiJVvtjxBP334UhJlmUH29JhAYZ+inU6PuTz3AtPKamGbw6MPVPZisYlTZW0IC3+ZEUheMosV3Lw1SiJNpPOIWf4q9CqAG05GL9MMGcAf2VgUs0LXEXj2n7XNUbUrgqgMTVWczmjVbS5pg/ReerhSCcEmwigsdUOduBOubCg74K9j9t52cMF6XIa39BrmDnBNI3oGTNAb3fsMNPKFXf3sNrGb1/901NLlu84Llp7SDl7uAQ5s3MaH796FdGcy+Z5uANXKxGCtQnszT1kbiH3rjUIlxZmoBGltjCt2co/I5cdsMH+93FzLi/C22F/Ezw7fHNcQ4ZhqXNtM7y1bA3L9lzroKnJV0gtvuEW1afXl6NrMPa04IeFMhYPAQ8sLwR0M7oRsJela/NGknVyppMaa+cQ2/VzHZOb4e1ayZvhbVX1qwJPS+rq68qBOeT1MYWSJgTi+Gj4HaXMs06ApMsnIT4ajBP2R+X/qPz/YeVXfd/NXoAlMeyWwH/bHLq9AVvDzt5w7QQQlmWQ4eFfHh19RwvIwRg2g064mlz6C6HahfSMZaQeLWJyIRdM8IwUTLMcLGhDCq0W3B92m05nbeDyPe3sX+DyWTJn50rzPyCLyamzc5C23p+0+bmDSHdhYPLyeZl8VJZMlZNZTMZzaEQGlNsop1MgmQJDpLIEHrivjC1SLYZndHz83LEptErxcSKAYFzsKia/YrqF+IDWSu/ica6cyDzVGqFejVu9eu7yuZAWtGSCGNAL0IFFTE4lcRIeCkgxaN5IVJo6/UgCvmOWiVaCiBpInUaO8U1Jvy6tbyi+vcyMv/fUklzCAgQZNZ63EX04SFUGI39M45cKJmd4x3++vqQRFWwCYv0YMgmfnRbk4Hdy9Wk0JgmdW1vEg4FQKRNzZWz8+uj16wEr+GAxHGi1FLhxc8JBQkmSJJKQg/ckoad1HfkAxOQMmAZNfjo9P387Gt2NP/3y9uPmgvMQuoPxqoCY9KO39s3IizKh97BKaEwSumDCQUKrF7SKWppXKzv3l1hDtDW0VHleKG2bgjKJTGQzkpGT1uxvmz3clzxBjygsnAPLQJuTsqdKIFArk1DyM2EppvWdVfcgq3o1sj/ZxTiR+4ksNJd2rzn5ITrv7e93tfjAFmzkM6yjx4ZxHX4lDUrSysCWjFsyBZvOvQhPlKAMTHKwc5UhBcyvvjxx40b62YO0vzQJVAaNxl6iL9F6STd/glDbORS8G2UnKlvF5MPo08fDUO58utoryT2sOjKTah+9Ue03iQwKZcyyVp2e9rWTEnAo1GwPXfffUCzZXjPTwCwQRiQsCY4D2gmciYJINKZ+zolowXBGpI9KjPHzHSfUudMY3p1R2pp5LvE1yRBOFTlIW/cunz0BqCy0sipVoooHgxKhqrjEwqm20M6dsSpvICK6YJq382YDE2bPKfNTmT9mZ4avH/GPHwY38d+Px1ekxakiiqfZxGv5bh1uFJoyvsOZjShNLq4QBLlsguyUql7vvasKo9kEYIRXSiDp23NJJz5T3ymdM8T78NsYY+TdaFy/XX9ZedJVhIvvNEw1mPlTQRDFKHm9/v/Q2+f6Oj7qTsBHt1VEuZyq7S+PkStAG+iO+h0TZnXwWwxDsIzNmb/J640fq6LeV2pNxsKDHRSCcYloPsPLusBuKCs4bjn0LDaLjEYU8zEk3A0tywkz8FmLqkLzNwd6FYb+Juf9LR3R0Nl8XQbduj3Kl4hw/tupP6pgAYYVp2kKvkk/7nvbaRrYWGlEJ/X/BnOV4RrNlsiKLWlMaUSV18WnrLeFq8KFOSZgYi7hJNwRr825+geyar795KpzwrIMHqFFY6MIVPytRiv8HvoTt9sxCA==
+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 RLS rule"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"post"}
+  path={"/api/v1/rowlevelsecurity/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Create a new RLS rule
+
+<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-rls-rule.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./create-a-new-rls-rule.StatusCodes.json")}
+>
+
+</StatusCodes>