Mobile-friendly website (responsive)

[bouteloua]

@silversea_starsong

Would it not be easier to expand the app

Remember too that there are two apps, with separate development pathways.

@silversea_starsong

My main request is being able to see my message inbox and reply to/send messages on the app.

See https://forum.inaturalist.org/t/messages-in-the-android-app/537