Web: Add mobile keyboard support / mobile keyboard is not working

_Maintainer edit: Due to engine limitations, to use the app on a mobile device, you need to have a physical keyboard at the moment, either plugged through the device charging port or connected via Bluetooth._

_The app is built on Godot 3 which does not support the on-screen keyboard on mobile devices. If someone would like to contribute this feature, this could perhaps be achieved by coordinating an invisible HTML form elements overlaid on top of editable text fields in the app, and by sending the input received through these HTML elements to the app._

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The app tells me that my mobile browser screen is too narrow and to use at my own risk.

I would enjoy using this during downtime at work on my phone. The issue I'm running into is I'm unable to tap the IDE portion and enter text to add or edit the code. When I tap, the cursor appears but the keyboard will not popup. I have tried with Opera Full, Opera Gaming Browser, Chrome, and Samsung's browser with the same issue. It would be great to have mobility functionality so I can learn no matter where I am.