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/versioned_docs/version-6.1.0/databases/supported/arc.mdx

@@ -0,0 +1,31 @@
+---
+title: Arc
+sidebar_label: Arc
+description: "Arc is a data platform with multiple connection options."
+hide_title: true
+---
+
+{/*
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+*/}
+
+import { DatabasePage } from '@site/src/components/databases';
+
+export const databaseInfo = {"time_grains":{"SECOND":true,"FIVE_SECONDS":false,"THIRTY_SECONDS":false,"MINUTE":true,"FIVE_MINUTES":false,"TEN_MINUTES":false,"FIFTEEN_MINUTES":false,"THIRTY_MINUTES":false,"HALF_HOUR":false,"HOUR":true,"SIX_HOURS":false,"DAY":true,"WEEK":true,"WEEK_STARTING_SUNDAY":false,"WEEK_STARTING_MONDAY":false,"WEEK_ENDING_SATURDAY":false,"WEEK_ENDING_SUNDAY":false,"MONTH":true,"QUARTER":true,"QUARTER_YEAR":false,"YEAR":true},"module":"superset.db_engine_specs.arc","limit_method":1,"limit_clause":true,"joins":true,"subqueries":true,"alias_in_select":true,"alias_in_orderby":true,"time_groupby_inline":false,"alias_to_source_column":false,"order_by_not_in_select":true,"expressions_in_orderby":false,"cte_in_subquery":true,"max_column_name":null,"sql_comments":true,"escaped_colons":true,"masked_encrypted_extra":false,"column_type_mapping":false,"function_names":false,"user_impersonation":false,"file_upload":true,"get_extra_table_metadata":false,"dbapi_exception_mapping":false,"custom_errors":false,"dynamic_schema":false,"catalog":false,"dynamic_catalog":false,"ssh_tunneling":true,"query_cancelation":false,"get_metrics":false,"where_latest_partition":false,"expand_data":false,"query_cost_estimation":false,"sql_validation":false,"score":28,"max_score":201,"documentation":{"description":"Arc is a data platform with multiple connection options.","categories":["Other Databases","Proprietary"],"pypi_packages":["arc-superset-arrow"],"connection_string":"arc+arrow://{api_key}@{hostname}:{port}/{database}","parameters":{"api_key":"Arc API key","hostname":"Arc hostname","port":"Arc port","database":"Database name"},"drivers":[{"name":"Apache Arrow (Recommended)","pypi_package":"arc-superset-arrow","connection_string":"arc+arrow://{api_key}@{hostname}:{port}/{database}","is_recommended":true,"notes":"Recommended for production. Provides 3-5x better performance using Apache Arrow IPC."},{"name":"JSON","pypi_package":"arc-superset-dialect","connection_string":"arc+json://{api_key}@{hostname}:{port}/{database}","is_recommended":false}],"notes":"Arc supports multiple databases (schemas) within a single instance. Each Arc database appears as a schema in SQL Lab.","category":"Other Databases"},"engine":"arc","engine_name":"Arc","engine_aliases":[],"default_driver":"arrow","supports_file_upload":true,"supports_dynamic_schema":false,"supports_catalog":false,"supports_dynamic_catalog":false};
+
+<DatabasePage name="Arc" database={databaseInfo} />