Remove Netlify PR previews and migrate preview/deployment to GitHub Pages

[CodexRaunak]

Current Behavior

PR previews are currently handled via Netlify, adding external dependency.

Desired Behavior

Migrate PR previews and site deployment fully to GitHub Pages using GitHub Actions. Previews should be generated per PR and cleaned up automatically on close.

Implementation

Replace Netlify preview system with GitHub Actions workflows:

• build-and-deploy-site.yml for production builds
• build-and-preview-site.yml for PR previews

Acceptance Tests

• PR previews are accessible via GitHub Pages
• Preview URLs are automatically commented on PRs
• Preview environments are removed when PRs close
• Production deployment works with custom domains
• No reliance on Netlify remains

---

Contributor Resources and Handbook

The layer5.io website uses Gatsby, React, and GitHub Pages. Site content is found under the master branch.

• 📚 See contributing instructions.
• 🎨 Wireframes and designs for Layer5 site in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Discussion Forum and Community Slack.

Join the Layer5 Community by submitting your community member form.