[FIX] web_editor, website: review grays

What was designed as a new feature appeared as a regression: users were
not able to choose a bootstrap gray as a background color anymore but
instead got the possibiility to choose a hardcoded gray. This commit
restores the use of the custom gray palette that themes can customize
and which automatically uses the correct text color when used as a
background. This also allows to remove ugly inline style from snippet
definitions and allows to solve bugs like the described below one:

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Also add bg-* classes on snippet cards:
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Snippet cards are often put (or may be put by the user) in an element
which have a bg-* class on it. This means that the card will still have
a white background (as chosen by BS4 by default) but the text color will
be adapted to that ancestor bg-* classed element.

This commit forces the card background color (as suggested by BS4) with
bg-* classes.

closes odoo/odoo#27637

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