[Fundamentals] Nav cleanup (#22585)

* Removed ref architecture link and changelog

* Renamed nav item and hid Overview

* Added redirect for main changelog link

* Update public/__redirects

Co-authored-by: Jun Lee <[email protected]>

---------

Co-authored-by: Jun Lee <[email protected]>

Author: dcpena

public/__redirects

@@ -688,7 +688,7 @@
 /fundamentals/subscriptions-and-billing/troubleshooting-failed-payments/ /billing/troubleshoot-failed-payments/ 301
 /fundamentals/subscriptions-and-billing/understand-invoices/ /billing/invoices/ 301
 /fundamentals/subscriptions-and-billing/update-billing-info/ /billing/update-billing-info/ 301
-
+/fundamentals/changelog/ /changelog/?product=fundamentals 301
 
 # gateway
 /gateway/about/ /cloudflare-one/policies/gateway/ 301

src/content/docs/fundamentals/changelog.mdx

@@ -1,12 +1,9 @@
 ---
 pcx_content_type: concept
-title: New features
+title: RSS Feeds
 sidebar:
-  order: 5
+  order: 10
+  group:
+    hideIndex: true
 ---
 
-At Cloudflare, we are constantly innovating and improving our products.
-
-The best way to stay up to date with this innovation is to read our [changelog](/changelog/).
-
-If you prefer to consume these updates in another format, we also offer [RSS feeds](/fundamentals/new-features/available-rss-feeds/).