chore: reduce cache TTLs — 2min HTML, 30min assets

Site gets frequent updates — previous TTLs (5min HTML, 24h assets)
were too aggressive.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Mohitsharma44

.github/workflows/deploy.yml

@@ -44,7 +44,7 @@ jobs:
             --exclude "infra/*" \
             --exclude "*.md" \
             --exclude ".gitignore" \
-            --cache-control "public, max-age=86400"
+            --cache-control "public, max-age=1800"
 
       - name: Set short cache on HTML files
         run: |
@@ -53,7 +53,7 @@ jobs:
             --exclude "*" \
             --include "*.html" \
             --metadata-directive REPLACE \
-            --cache-control "public, max-age=300" \
+            --cache-control "public, max-age=120" \
             --content-type "text/html; charset=utf-8"
 
       - name: Invalidate CloudFront cache

README.md

@@ -25,7 +25,7 @@ When changes are pushed to `master`:
 2. **Cache clear** — CloudFront CDN cache is invalidated
 3. **Live** — Changes are available on all domains (cuspuo.org, cuspuo.com, and their www variants)
 
-HTML files are cached for 5 minutes; other assets (images, CSS, JS) are cached for 24 hours.
+HTML files are cached for 2 minutes; other assets (images, CSS, JS) are cached for 30 minutes.
 
 ## File Structure