feat: examples page

[luigidenora]

Hi, we need more examples right now to fill the page <3

Draft integration in astro docs :

The process is completely automated: whenever we drop a new example in the public folder or tweak the generator script, the previews are generated automatically.

• We need to test if the workflow can update the Git tree automatically.

 - name: Commit thumbs & manifest 
        run: |
          git config user.name "ci-bot"
          git config user.email "ci@example"
          git add public/examples src/data/examples.manifest.json
          git commit -m "chore: update example previews" || echo "no changes"
          git push || true

i also add this button to navigate easly in this examples page :

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud