Allow iphone and android support webRTC

Allow new iphone and android to use jitsi without the app.

https://caniuse.com/#search=webrtc

We have no plans to allow this in the short term. We are invested in the mobile apps, which can provide a much better user experience thanks to integration with system services such as CallKit.

Can you create the option to Continue without app? I think it is a bad user experience to download app, when it is not necessary

We have no plans to do that.