PERF: add some minimal caching to javascripts folder

config/nginx.sample.conf

@@ -107,6 +107,13 @@ server {
       break;
     }
 
+    # some minimal caching here so we don't keep asking
+    # longer term we should increas probably to 1y
+    location ~ ^/javascripts/ {
+      expires 1d;
+      add_header Cache-Control public,immutable;
+    }
+
     location ~ ^/assets/(?<asset_path>.+)$ {
       expires 1y;
       # asset pipeline enables this