docs: cut 6.1.0 versions for docs, admin_docs, developer_docs, components

- Snapshot all four versioned docs sections at v6.1.0; master continues to
  serve as "Next" (lastVersion: current, banner: unreleased) so editing
  master keeps updating the canonical URLs
- Enable the previously-disabled components plugin and version it
- Rename stale "developer_portal" references to "developer_docs" across
  package.json scripts, manage-versions.mjs, theme files (DocVersionBadge,
  DocVersionBanner), DOCS_CLAUDE.md, and README.md (URL backward-compat
  redirect /developer_portal/* preserved)
- Add admin_docs version scripts; drop dead "tutorials" plugin id from
  the version badge
- Generalize fixVersionedImports in manage-versions.mjs to walk every
  section's snapshot and rewrite ../../src/ and ../../data/ imports,
  catching admin_docs and components files that previous version cuts
  would have broken
- Remove orphan files: developer_portal_versions.json,
  tutorials_versions.json, and stray empty versions.json files inside
  components/ and developer_docs/ content directories

docs/developer_docs_versioned_docs/version-6.1.0/api/get-chart-thumbnail.api.mdx

@@ -0,0 +1,68 @@
+---
+id: get-chart-thumbnail
+title: "Get chart thumbnail"
+description: "Compute or get already computed chart thumbnail from cache."
+sidebar_label: "Get chart thumbnail"
+hide_title: true
+hide_table_of_contents: true
+api: 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
+sidebar_class_name: "get 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={"Get chart thumbnail"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"get"}
+  path={"/api/v1/chart/{pk}/thumbnail/{digest}/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Compute or get already computed chart thumbnail from cache.
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./get-chart-thumbnail.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./get-chart-thumbnail.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./get-chart-thumbnail.StatusCodes.json")}
+>
+
+</StatusCodes>