Keybase Client: make zooming obvious

Hi there,

As someone with poor sight, would it be possible to add an option to increase the font size in the client(s) please?

Thanks :)

The issue does not name files, tests, platforms, or a specific client entry point. First identify which Keybase client(s) are in scope and where font-size or zoom settings are handled; done means users can increase the client font size and the behavior is verified for the affected client(s).

Written by the indexing model from the issue text.