fix(docs,www): redirect feature status page to /features (#43224)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Redirect + link cleanup: deprecating the docs feature status page in
favour of the marketing features page.

## What is the current behavior?

supabase.com/docs/guides/getting-started/features is a standalone docs
page with a flat feature status table. The existing /docs/features short
URL redirects to this docs page. A self-hosted troubleshooting article
links to the old docs page.

## What is the new behavior?

/docs/guides/getting-started/features and /docs/features both
permanently redirect to /features (supabase.com/features)
The self-hosted troubleshooting article now links to /features
The features.mdx file is left in place; the redirect intercepts all
traffic before it renders

## Additional context

N/A

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Refactor**
  * Reorganized navigation menu and documentation link paths
* Updated feature-related links across guides and troubleshooting
sections
* Added redirect rules to maintain backward compatibility with previous
URLs

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Ana Mogul <ana1337x@users.noreply.github.com>
Co-authored-by: Chris Chinchilla <chris.ward@supabase.io>

apps/docs/content/troubleshooting/are-all-features-available-in-self-hosted-supabase-THPcqw.mdx

@@ -13,7 +13,7 @@ The self-hosted version is pretty similar to the hosted one. It might not always
 ### Feature availability
 
 To know what features are available in the self-hosted version, refer to the comprehensive list here:
-[Supabase Features](/docs/guides/getting-started/features#generally-available)
+[Supabase Features](/features)
 
 ### Self-hosting documentation
 

apps/www/lib/redirects.js

@@ -1826,7 +1826,12 @@ module.exports = [
   {
     permanent: true,
     source: '/docs/features',
-    destination: '/docs/guides/getting-started/features',
+    destination: '/features',
+  },
+  {
+    permanent: true,
+    source: '/docs/guides/getting-started/features',
+    destination: '/features',
   },
   {
     permanent: true,