FEATURE: enable NGINX brotli support unconditionally

Previously we would rely on enable brotli in the web template to turn this
on, going forward this is default on

config/nginx.sample.conf

@@ -119,7 +119,7 @@ server {
     location ~ ^/assets/(?<asset_path>.+)$ {
       expires 1y;
       # asset pipeline enables this
-      # brotli_static on;
+      brotli_static on;
       gzip_static on;
       add_header Cache-Control public,immutable;
       # HOOK in asset location (used for extensibility)