docs: add announcements landing page

[ChenhanYu]

Summary

• Add a JS/static announcements landing page for GitHub Pages
• Keep existing Sphinx docs available under the api/ subpath
• Add PR-authored announcement posts with tags, search/filtering, image support, and a DSpark vs Domino sample post

Jira: https://jirasw.nvidia.com/browse/OMNIML-5476

Verification

• python3 docs/build_site.py --output docs/build/html
• Local preview checked at http://127.0.0.1:8088/

Publishing approval

User explicitly approved publishing the dspark-vs-domino sample post and copied image assets from modelopt-site to public GitHub in NVIDIA/Model-Optimizer.

Notes

• Full uv run nox -s docs was attempted locally, but dependency setup/download did not complete in a reasonable time; CI should provide the authoritative full docs build and PR Pages preview.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch chenhany/omniml-5476

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[github-actions]

PR Preview Action v1.8.1
🚀 View preview at https://NVIDIA.github.io/Model-Optimizer/pr-preview/pr-1971/
Built to branch gh-pages at 2026-07-14 18:46 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.91%. Comparing base (7ed19b2) to head (890ae45).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1971      +/-   ##
==========================================
- Coverage   77.92%   76.91%   -1.02%     
==========================================
  Files         519      522       +3     
  Lines       58217    59483    +1266     
==========================================
+ Hits        45366    45749     +383     
- Misses      12851    13734     +883     

Flag	Coverage Δ
unit	55.39% <ø> (-0.08%)	⬇️

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