Add GitHub Actions for Astro deploy and PR previews

[sudheer]

Motivation

• Migrate site build and hosting from Hugo to Astro and provide preview deployments for pull requests.
• Ensure production builds are published to GitHub Pages and PR get a shareable preview URL.

[github-actions]

❌ PR preview deployment finished but URL was not reachable in time.

Please check Settings → Pages:

• Source: Deploy from a branch
• Branch: gh-pages
• Folder: /(root)

Then re-run the Astro PR Preview workflow.

[github-actions]

ℹ️ Astro preview skipped for this PR.

Reason: this branch does not yet contain a complete Astro project (package.json + astro.config.*).
Once Astro migration files are present, this workflow will build and deploy preview automatically.

[github-actions]

❌ PR preview deployment finished but URL was not reachable in time.

Please check Settings → Pages:

• Source: Deploy from a branch
• Branch: gh-pages
• Folder: /(root)

Then re-run the Preview on Pull Request workflow.

[github-actions]

🔍 PR preview is ready.

Open preview: https://sudheer.github.io/sudheer.github.io/preview/pr-2/

[github-actions]

🔍 PR preview is ready.

Open preview: https://sudheer.github.io/preview/pr-2/

[github-actions]

🔍 PR preview is ready.

Open preview: https://sudheer.github.io/preview/pr-2/

[github-actions]

🔍 PR preview is ready.

Open preview: https://sudheer.github.io/preview/pr-2/