[Fundamentals] Nav cleanup

[dcpena]

• Removed link to Reference Architecture and Changelog in nav.
• Redirected former Changelog link to main Changelog page in dev docs.
• Renamed New Features to RSS Feeds and hid Overview page under section

Addresses PCX-17536

[hyperlint-ai]

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PR Change Summary

Cleaned up navigation by removing outdated links and renaming sections for clarity.

• Removed link to Reference Architecture and Changelog in navigation
• Redirected former Changelog link to the main Changelog page in development docs
• Renamed 'New Features' section to 'RSS Feeds'
• Hid Overview page under the new RSS Feeds section

Modified Files

• src/content/docs/fundamentals/new-features/index.mdx

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[github-actions]

This PR changes current filenames or deletes current files. Make sure you have redirects set up to cover the following paths:

• /fundamentals/changelog/
• /fundamentals/reference-architecture/

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/public/__redirects	@GregBrimble, @KianNH, @pedrosousa, @WalshyDev, @cloudflare/pcx-technical-writing
/src/content/docs/fundamentals/	@dcpena, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://66c2d7c2.preview.developers.cloudflare.com
Preview Branch URL: https://dpena-nav-edits.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/fundamentals/changelog/	https://dpena-nav-edits.preview.developers.cloudflare.com/fundamentals/changelog/
https://developers.cloudflare.com/fundamentals/new-features/	https://dpena-nav-edits.preview.developers.cloudflare.com/fundamentals/new-features/
https://developers.cloudflare.com/fundamentals/reference-architecture/	https://dpena-nav-edits.preview.developers.cloudflare.com/fundamentals/reference-architecture/