infra: add brotli & gzip compression to selfhost previews

[AyushAgrawal-A2]

closes #2177

[qa-wolf]

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[vercel]

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Name	Status	Preview	Updated (UTC)
quadratic	❌ Failed (Inspect)		Jan 14, 2025 3:49am

[qa-wolf]

QA Wolf here! As you write new code it's important that your test coverage is keeping up.
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[github-actions]

Preview - Build & Deploy Images

✅ Build images
✅ Deploy images

🕒 Last deployed: Jan 14, 2025 at 03:21 AM UTC

🔗 URL: https://ayush-try-brotli.quadratic-preview.com

[github-actions]

Preview - Stack

✅ Preview stack deleted successfully.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.15%. Comparing base (ad40f75) to head (8606d2b).
Report is 16 commits behind head on ayush/2075.

Additional details and impacted files

@@             Coverage Diff             @@
##           ayush/2075    #2183   +/-   ##
===========================================
  Coverage       91.15%   91.15%           
===========================================
  Files             296      296           
  Lines           62732    62732           
===========================================
  Hits            57182    57182           
  Misses           5550     5550           

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