docs: add fonts cache header to nginx config

docs/pronounscc.nginx

@@ -64,6 +64,13 @@ server {
         proxy_pass http://127.0.0.1:9000;
     }
 
+    location ~ ^/fonts {
+        expires 1y;
+        add_header Cache-Control "public, no-transform";
+
+        proxy_pass http://127.0.0.1:3000;
+    }
+
     location / {
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';