chore: add banners

[ovflowd]

This PR adds Node.js's v18 EOL banner and JSConf's General Admission Tickets Pill.

Closes #7678

[Copilot]

Copilot wasn't able to review any files in this pull request.

Files not reviewed (1)

• apps/site/site.json: Language not supported

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Apr 24, 2025 8:42pm

[ovflowd]

cc @nodejs/nodejs-website requesting fast-track, please approve with a 👍

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟢 99	🟢 100	🟢 100	🟢 91	🔗
/en/about	🟢 100	🟢 100	🟢 100	🟢 91	🔗
/en/about/previous-releases	🟢 99	🟢 100	🟢 100	🟢 92	🔗
/en/download	🟢 99	🟢 100	🟢 100	🟢 91	🔗
/en/blog	🟢 100	🟢 100	🟢 96	🟢 92	🔗

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.78%. Comparing base (4c7a741) to head (fee24dc).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7685      +/-   ##
==========================================
- Coverage   74.80%   74.78%   -0.02%     
==========================================
  Files          98       98              
  Lines        7842     7840       -2     
  Branches      197      197              
==========================================
- Hits         5866     5863       -3     
- Misses       1974     1975       +1     
  Partials        2        2              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.