Create a style guide for new CiviCRM components

c.f. PR 17775, let's:

document the classes used by the new CiviCRM extensions (api4, search, afform, mosaico, contact layout editor)
create a style guide based on that
start writing CSS that would make Bootstrap optional

I started a wiki page here that lists the main classes found in afform and search:

It would also be nice to have something equivalent to the Shoreditch Styleguide - i.e. an extension to demo the documented CSS?

What else do we need? @nicol

Edited Jul 12, 2020 by eileen

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