Information page on the website that says what platforms we support

[burkmarr]

This issue was transferred from another repository which was set up to track issues on the BSBI atlas project. But they really belong here with the code. So I have transferred open issues only.

We've had another query from someone to say that the atlas doesn't function on their 'elderly iPad' running iOS 12.5. We could perhaps do with an information page on the atlas that indicates what platforms/browsers the software is known to run on.

[burkmarr]

@japonicus wrote: It might be possible to do this discreetly using https://browser-update.org/ - a script that displays a prompt and advice only for people using incompatible browsers. It appears to be reasonably configurable.

[sacrevert]

Possibly linked to reported poor performance of site on Android phones. Hard to describe, but some users report page scrolling and loading issues on both new and old Android phones