Removing Pr-Preview from netlify, moving to GitHub page

[saurabhraghuvanshii]

Description

This PR fixes #

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[arjunmehta-git]

Thanks for taking this on, @saurabhraghuvanshii. Moving PR previews from Netlify to GitHub Pages is a meaningful infrastructure change that reduces our external dependency, and the workflow changes look structurally sound.

A few things to address before merge:

• Empty description and issue reference — The PR body is still the template placeholder and "This PR fixes #" is blank. This is a significant workflow change that deserves a clear description of what's changing, why Netlify is being removed, and what the GitHub Pages preview URL pattern will look like for contributors.
• Preview verification — Has the new GitHub Pages preview workflow been tested end-to-end on this branch? Specifically: does a commit to this PR trigger a deploy, and does the resulting preview URL work as expected? Broken PR previews would block the entire contributor review cycle.
• Removal of preview-site.yml — Deleting the Netlify preview workflow means the l5io bot's preview comments ("🚀 Preview for commit...") will stop appearing. Confirm the GitHub Pages workflow produces an equivalent notification so contributors know where to find the preview.
• Signed commits — The checkbox is checked, good.

The intent is right. Please flesh out the description and confirm the new workflow is functional.