docs: rename /docs to /user-docs for consistency

Rename the user documentation URL path from /docs to /user-docs to match
the naming convention of /admin-docs and /developer-docs.

Changes:
- Add routeBasePath: 'user-docs' to preset-classic docs config
- Add createRedirects for /docs/* → /user-docs/* pattern-based redirects
- Update all redirect destinations from /docs/* to /user-docs/*
- Update navbar links to use /user-docs/
- Update sitemap priorities to use /user-docs/
- Update internal links in user docs, admin docs, and developer docs
- Update footer security link to /admin-docs/security/

All old /docs/* URLs will automatically redirect to /user-docs/* via
the createRedirects function. Versioned docs at /docs/6.0.0/* remain
unchanged.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/admin_docs/configuration/sql-templating.mdx

@@ -8,7 +8,7 @@ version: 1
 # SQL Templating
 
 :::tip Looking to use SQL templating?
-For a user-focused guide on writing Jinja templates in SQL Lab and virtual datasets, see the [SQL Templating User Guide](/docs/using-superset/sql-templating). This page covers administrator configuration options.
+For a user-focused guide on writing Jinja templates in SQL Lab and virtual datasets, see the [SQL Templating User Guide](/user-docs/using-superset/sql-templating). This page covers administrator configuration options.
 :::
 
 ## Jinja Templates

docs/admin_docs/index.md

@@ -15,9 +15,9 @@ This section contains documentation for system administrators and operators who
 
 ## Related
 
-- **[Database Drivers](/docs/databases)** - See User Docs for database connection setup (admins may need to install drivers)
+- **[Database Drivers](/user-docs/databases)** - See User Docs for database connection setup (admins may need to install drivers)
 
 ## Looking for something else?
 
-- **[User Documentation](/docs/intro)** - Guides for analysts and business users
+- **[User Documentation](/user-docs/intro)** - Guides for analysts and business users
 - **[Developer Documentation](/developer-docs)** - Contributing, extensions, and development guides

docs/admin_docs/installation/docker-compose.mdx

@@ -21,7 +21,7 @@ with our [installing on k8s](https://superset.apache.org/admin-docs/installation
 documentation.
 :::
 
-As mentioned in our [quickstart guide](/docs/quickstart), the fastest way to try
+As mentioned in our [quickstart guide](/user-docs/quickstart), the fastest way to try
 Superset locally is using Docker Compose on a Linux or Mac OSX
 computer. Superset does not have official support for Windows. It's also the easiest
 way to launch a fully functioning **development environment** quickly.