Connecting the iOS app to local webapp
This MR contains several changes in the code replacing hardcoded `gitter.im` references with using URL from config. There is a change to Transport security settings, allowing HTTP connections to `localhost:5000`. Lastly, the updated README explains the necessary steps for connecting to the local webapp. Thank you @MadLittleMods for unblocking me with the transport security settings, saving me hours if not days of struggle.
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