Fix nginx: remove broken font path rewrite that caused double fonts/ in URL (STI-91)

The sub_filter rule '../fonts/' -> 'fonts/' was rewriting relative font
paths in CSS served from /ahnenforschung/fonts/fonts.css. This caused
the browser to resolve font URLs to /ahnenforschung/fonts/fonts/MaterialIcons.woff2
(double fonts/ directory). The original ../fonts/ paths resolve correctly
from the subpath without rewriting.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

deploy-production/nginx.conf

@@ -126,8 +126,7 @@ server {
         # JS: service worker route handling
         sub_filter 'createHandlerBoundToURL("/index.html")' 'createHandlerBoundToURL("/ahnenforschung/index.html")';
 
-        # CSS: fix relative font paths (served from subpath, ../fonts/ won't resolve)
-        sub_filter '../fonts/' 'fonts/';
+        # CSS: font paths — ../fonts/ resolves correctly from subpath, no rewrite needed
 
         # WebSocket support
         proxy_http_version 1.1;