docs: cut 6.1.0 versions for docs, admin_docs, developer_docs, components

Snapshots all four versioned Docusaurus sections at v6.1.0. Built on
top of the version-cutting tooling work in chore/docs-cut-6.1.0-versions
so the snapshot benefits from:

- Auto-gen refresh before snapshotting (database pages from engine
  spec metadata, API reference from openapi.json, component pages
  from Storybook stories) — captured at the SHA we cut from rather
  than whatever happened to be on disk.
- Data-import freeze: country list, feature flag table, database
  diagnostics, and component metadata are copied into snapshot-local
  `_versioned_data/` dirs so the historical version doesn't silently
  mutate when the source files change.
- Depth-aware import-path rewriter that handles deeply-nested
  component MDX files referencing `../../../src/` from the snapshot.

Versioning behavior: `lastVersion` stays at `current` for every
section, so the canonical URLs (`/docs/...`, `/admin-docs/...`,
`/developer-docs/...`, `/components/...`) continue to render content
from master. The `current` version is consistently labeled "Next"
with an `unreleased` banner, and `6.1.0` is a historical pin
accessible only via its explicit version segment.

Component playground: previously `disabled: true` in versions-config.json,
now enabled and versioned. The plugin block in docusaurus.config.ts
was already gated only by the `disabled` flag, so no other code
changes were needed to bring it back online.

The frozen `databases.json` in the snapshot is the canonical 80-database
artifact from the latest committed state in master (preserved by the
generator's input-hash cache), not a fallback regenerated from a
local Flask environment.

docs/developer_docs_versioned_docs/version-6.1.0/contributing/resources.md

@@ -0,0 +1,133 @@
+---
+title: Resources
+sidebar_position: 8
+---
+
+<!--
+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.
+-->
+
+# Resources
+
+## High Level Architecture
+
+```mermaid
+flowchart TD
+
+  %% Top Level
+  LB["<b>Load Balancer(s)</b><br/>(optional)"]
+  LB -.-> WebServers
+
+  %% Web Servers
+  subgraph WebServers ["<b>Web Server(s)</b>"]
+    WS1["<b>Frontend</b><br/>(React, AntD, ECharts, AGGrid)"]
+    WS2["<b>Backend</b><br/>(Python, Flask, SQLAlchemy, Pandas, ...)"]
+  end
+
+  %% Infra
+  subgraph InfraServices ["<b>Infra</b>"]
+    DB[("<b>Metadata Database</b><br/>(Postgres / MySQL)")]
+
+    subgraph Caching ["<b>Caching Subservices<br/></b>(Redis, memcache, S3, ...)"]
+      direction LR
+      DummySpace[" "]:::invisible
+      QueryCache["<b>Query Results Cache</b><br/>(Accelerated Dashboards)"]
+      CsvCache["<b>CSV Exports Cache</b>"]
+      ThumbnailCache["<b>Thumbnails Cache</b>"]
+      AlertImageCache["<b>Alert/Report Images Cache</b>"]
+	  QueryCache -- " " --> CsvCache
+	  linkStyle 1 stroke:transparent;
+      ThumbnailCache -- " " --> AlertImageCache
+	  linkStyle 2 stroke:transparent;
+    end
+
+    Broker(("<b>Message Queue</b><br/>(Redis / RabbitMQ / SQS)"))
+  end
+
+  AsyncBackend["<b>Async Workers (Celery)</b><br>required for Alerts & Reports, thumbnails, CSV exports, long-running workloads, ..."]
+
+  %% External DBs
+  subgraph ExternalDatabases ["<b>Analytics Databases</b>"]
+    direction LR
+    BigQuery[(BigQuery)]
+    Snowflake[(Snowflake)]
+    Redshift[(Redshift)]
+    Postgres[(Postgres)]
+    Postgres[(... any ...)]
+  end
+
+  %% Connections
+  LB -.-> WebServers
+  WebServers --> DB
+  WebServers -.-> Caching
+  WebServers -.-> Broker
+  WebServers -.-> ExternalDatabases
+
+  Broker -.-> AsyncBackend
+
+  AsyncBackend -.-> ExternalDatabases
+  AsyncBackend -.-> Caching
+
+
+
+  %% Legend styling
+  classDef requiredNode stroke-width:2px,stroke:black;
+  class Required requiredNode;
+  class Optional optionalNode;
+
+  %% Hide real arrow
+  linkStyle 0 stroke:transparent;
+
+  %% Styling
+  classDef optionalNode stroke-dasharray: 5 5, opacity:0.9;
+  class LB optionalNode;
+  class Caching optionalNode;
+  class AsyncBackend optionalNode;
+  class Broker optionalNode;
+  class QueryCache optionalNode;
+  class CsvCache optionalNode;
+  class ThumbnailCache optionalNode;
+  class AlertImageCache optionalNode;
+  class Celery optionalNode;
+
+  classDef invisible fill:transparent,stroke:transparent;
+```
+
+## Entity-Relationship Diagram
+
+For the full interactive Entity-Relationship Diagram, please visit the [developer documentation](/developer-docs/contributing/resources).
+
+You can also [download the .svg](https://github.com/apache/superset/tree/master/docs/static/img/erd.svg) directly from GitHub.
+
+## Additional Resources
+
+### Official Documentation
+- [Apache Superset Documentation](https://superset.apache.org/docs/intro)
+- [API Documentation](https://superset.apache.org/docs/api)
+- [Configuration Guide](https://superset.apache.org/admin-docs/configuration/configuring-superset)
+
+### Community Resources
+- [Apache Superset Blog](https://preset.io/blog/)
+- [YouTube Channel](https://www.youtube.com/channel/UCMuwrvBsg_jjI2gLcm04R0g)
+- [Twitter/X](https://twitter.com/ApacheSuperset)
+
+### Development Tools
+- [GitHub Repository](https://github.com/apache/superset)
+- [PyPI Package](https://pypi.org/project/apache-superset/)
+- [Docker Hub](https://hub.docker.com/r/apache/superset)
+- [npm Packages](https://www.npmjs.com/search?q=%40superset-ui)