Fix missing stylesheets/extra.css breaking documentation header

[Copilot]

• Investigate the issue - documentation header not showing online
• Identify root cause: mkdocs.yml references stylesheets/extra.css but the file doesn't exist in docs/stylesheets/
• The .gitignore also has *.css which would block any CSS files from being committed
• Create docs/stylesheets/extra.css file
• Add exception to .gitignore for docs/stylesheets/*.css
• Verify the fix by building documentation locally
• Run code review - passed with no issues
• Run CodeQL check - no code changes to analyze
• Address user feedback - clarified that the 404 issue for the results page appears to be resolved (page exists on gh-pages), and the CSS fix ensures proper stylesheet loading

Original prompt

When I build the documentation locally I see the header with a menu and such, but online it doesn't show up

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[OmerShubi]

@copilot Are you sure this solves the problem?My issue is with https://eyebench.github.io/eyebench/results/eyebench_metric_tables/ returning 404

[Copilot]

@copilot Are you sure this solves the problem?My issue is with https://eyebench.github.io/eyebench/results/eyebench_metric_tables/ returning 404

Thank you for the clarification. The fix I made addresses a missing stylesheets/extra.css file that was referenced in mkdocs.yml but didn't exist. I can see the results/eyebench_metric_tables/index.html page currently exists on the gh-pages branch (verified just now), so it should be accessible.

If the page is still returning 404 for you, it may be a caching issue - try clearing your browser cache or waiting for GitHub Pages propagation. If the issue persists, could you provide more details about when you see the 404 (e.g., is it only the results page, or is the entire site showing issues)?

The CSS fix I made (commit 28c9254) is still valid as it ensures the custom stylesheet referenced in the config is properly committed.