Removed unmaintained device capabilities list

[jdiehl]

@ConnorLand

[ConnorLand]

I think that it's useful to inform devs about which what supported per browser, but maybe this table is not achieving that goal. @jdiehl

What's the most normal way a dev checks which features are compatible with which platforms/browsers? A site like https://caniuse.com/, or the official Mozilla docs?

Because I think we can delete our table, but if we do than we do need to provide devs with a bit more guidance on the following;
(1) which common PWA features depend per browser
(2) how they devs check these features using 3rd party tools.

[jdiehl]

@ConnorLand I have added a link to mdn documentation

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