Support servers.json in a conf.d directory
Support servers.json in a conf.d directory

In Cattle (and maybe other Docker environments) you can't mount specific files, but
have to mount a whole volume as a directory.

We now allow the servers.json to be looked for inside a specific folder to support
that use case.

shlinkio/shlink-web-client,shlinkio/shlink-web-client,shlinkio/shlink-web-client,shlinkio/shlink-web-client