Update Dashboard to better support multiple virtual hosts

[mgburns]

nginx-proxy supports multiple virtual hosts, including the use of a wildcard, e.g:

VIRTUAL_HOST=skelams.ups.dock,*.skelams.ups.dock

Wildcard subdomains, however, are not supported in the Ups Dock Dashboard:

Clicking on the second site leads you to the (invalid) url http://*.skelams.ups.dock.