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-slack-channels.api.mdx

@@ -0,0 +1,68 @@
+---
+id: get-slack-channels
+title: "Get slack channels"
+description: "Get slack channels"
+sidebar_label: "Get slack channels"
+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 slack channels"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"get"}
+  path={"/api/v1/report/slack_channels/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Get slack channels
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./get-slack-channels.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./get-slack-channels.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./get-slack-channels.StatusCodes.json")}
+>
+
+</StatusCodes>