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-a-guest-token.RequestSchema.json

@@ -0,0 +1 @@
+{"title":"Body","body":{"content":{"application/json":{"schema":{"properties":{"resources":{"items":{"properties":{"id":{"type":"string"},"type":{"enum":["dashboard"]}},"required":["id","type"],"type":"object","title":"Resource"},"type":"array"},"rls":{"items":{"properties":{"clause":{"type":"string"},"dataset":{"type":"integer"}},"required":["clause"],"type":"object","title":"RlsRule"},"type":"array"},"user":{"properties":{"first_name":{"type":"string"},"last_name":{"type":"string"},"username":{"type":"string"}},"type":"object","title":"User2"}},"required":["resources","rls"],"type":"object","title":"GuestTokenCreate"},"example":{"resources":[{}],"rls":[{}],"user":{"first_name":"string","last_name":"string","username":"string"}}}},"description":"Parameters for the guest token","required":true}}