Add ability to customize app Web UI under "Access & Ports"

[Manchild25]

Currently, you can only change ports for the application, I run containers over Nginx and use that to access containers with web interfaces.

So instead of 192.168.1.1 --> container.domain.com

[SurceBeats]

We may add a redir:// flag to make people able to redirect apps to external links instead of the internal /app/ endpoint, we'll explore this further. Thanks for the suggestion!