Improve the UX for Custom Locations

[mike548141]

The UX overall is really good, but I have more than a dozen Custom Locations on a proxy host.
My ideas are,

1. Add an accordion UI element (or similar) to Proxy Hosts so you can expand to see a list of custom locations under a Proxy Host, without leaving the current interface i.e. a quick look.
2. Allow the Edit Proxy Host form to expand wider (screen size allowing) so that each Location fits in one "row", in more of a table format, so that its easier to see all the Locations you already have as you edit/create.

I tried traefik first, I quickly moved on to NPM and it is so much easier to get setup. Thanks for everything you have made in this app.