Sync Up Example Config

[DevPentest]

Would appreciate if the example config file deploy/app.env.example to contain all the default configs versus going to wiki.

Then we can sed what we need during initial installation/updating, rather than appending to the file.

For instance HTTP_PROXY, ENABLED_PLUGINS, DISABLE_WEBSOCKETS, etc.

[aronmolnar]

Thank you for your suggestions, which I fully understand.

We, however, decided to move major parts of the app.env settings to the web UI, which makes improving the app.env.example obsolete. See #378

I hope that this would be an even greater improvement than adding the config options to the example configuration.