It used Broadway as an easy "reuse the same code into web application" way for me, but Broadway
is not very good for this. This feature should be made using some better dedicated framework for
building websites (so it can work better and support different screen sizes).
All the WebSocket functionality needed for this will remain (and be documented at a later point
when expanded and stable), so if anyone would like to make such remote controlling app, will be
free to do so (outside of Clapper code).
Recent libadwaita has renamed "can-swipe-back" into "can-navigate-back".
Set both in JS code instead of UI file in order to support all libadwaita versions.
Fixes#185
