Docker: remove asset forward to index.php

This makes logging look a little better for development purposes.
Now, `docker-compose logs php-fpm` will only show details about PHP
accesses, while `docker-compose logs nginx` will show accesses
regarding PHP assets.

Signed-off-by: Kevin Morris <kevr@0cost.org>

docker/config/nginx.conf

@@ -77,6 +77,10 @@ http {
             include        fastcgi_params;
         }
 
+        location ~ .+\.(css|js?|jpe?g|png|svg|ico)/?$ {
+            try_files $uri =404;
+        }
+
         location ~ .* {
             rewrite ^/(.*)$ /index.php/$1 last;
         }