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/schemas/datasetrestapi-put.schema.mdx

@@ -0,0 +1,31 @@
+---
+id: datasetrestapi-put
+title: "DatasetRestApi.put"
+description: ""
+sidebar_label: "DatasetRestApi.put"
+hide_title: true
+hide_table_of_contents: true
+schema: true
+sample: {"always_filter_main_dttm":false,"cache_timeout":0,"catalog":"string","columns":[{"advanced_data_type":"string","column_name":"string","description":"string","expression":"string","extra":"string","filterable":true,"groupby":true,"id":0,"is_active":true,"is_dttm":true,"python_date_format":"string","type":"string","uuid":"3fa85f64-5717-4562-b3fc-2c963f66afa6","verbose_name":"string"}],"database_id":0,"default_endpoint":"string","description":"string","external_url":"string","extra":"string","fetch_values_predicate":"string","filter_select_enabled":true,"folders":[{"children":[null],"description":"string","name":"string","type":"metric","uuid":"3fa85f64-5717-4562-b3fc-2c963f66afa6"}],"is_managed_externally":true,"is_sqllab_view":true,"main_dttm_col":"string","metrics":[{"currency":"string","d3format":"string","description":"string","expression":"string","extra":"string","id":0,"metric_name":"string","metric_type":"string","uuid":"3fa85f64-5717-4562-b3fc-2c963f66afa6","verbose_name":"string","warning_text":"string"}],"normalize_columns":true,"offset":0,"owners":[0],"schema":"string","sql":"string","table_name":"string","template_params":"string"}
+custom_edit_url: null
+---
+
+import Schema from "@theme/Schema";
+import Heading from "@theme/Heading";
+
+<Heading
+  as={"h1"}
+  className={"openapi__heading"}
+  children={"DatasetRestApi.put"}
+>
+</Heading>
+
+
+
+
+
+<Schema
+  {...require("./datasetrestapi-put.Schema.json")}
+>
+
+</Schema>