nginx: no-cache (revalidate) so deploys show immediately instead of 7-day cache

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

nginx.conf

@@ -10,15 +10,10 @@ server {
     gzip_min_length 1024;
     gzip_types text/plain text/css application/javascript image/svg+xml application/json;
 
-    # Long cache for static assets (images, video, fonts, css/js)
-    location ~* \.(?:css|js|jpg|jpeg|png|webp|gif|ico|svg|mp4|woff2?)$ {
-        expires 7d;
-        add_header Cache-Control "public";
-        access_log off;
-    }
-
-    # Serve files directly; .html pages resolve by their own URL
+    # Always revalidate with the server (cheap 304s via ETag) so new deploys show up
+    # immediately instead of being stuck behind a long browser cache.
     location / {
         try_files $uri $uri/ =404;
+        add_header Cache-Control "no-cache";
     }
 }