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/create-a-new-dataset.api.mdx

@@ -0,0 +1,68 @@
+---
+id: create-a-new-dataset
+title: "Create a new dataset"
+description: "Create a new dataset"
+sidebar_label: "Create a new dataset"
+hide_title: true
+hide_table_of_contents: true
+api: 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
+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 dataset"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"post"}
+  path={"/api/v1/dataset/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Create a new dataset
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  parameters={undefined}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./create-a-new-dataset.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./create-a-new-dataset.StatusCodes.json")}
+>
+
+</StatusCodes>