Currently, to preview any front-end changes, the broker needs to be
restarted. This takes a good few seconds and breaks the flow. With this
Caddyfile & some symlinks e.g. `rabbitmq_top/priv/www/js/top.js
rabbitmq_management/priv/www/js`, previewing front-end changes is just a
browser-refresh away. To try this out, install
[caddy](https://caddyserver.com/) locally and just run `caddy` in
rabbitmq_management dir.
cc @michaelklishin @dumbbell for discuss and better alternatives
[#151455442]
Gerhard Lazu