Previously, there were a number of issues coming up repeatedly related
to unexpected behavior of nested lists and similar cases. This is
because we're trying to use lists for their semantic value occasionally
(such as for lists of topics inside a particular group), but the default
styles (including the ones from Spectre.css) have set them up
specifically for text-based lists.
This commit addresses this by changing the base ol/ul styles back to
something very neutral (no margins or marker for list items), and then
adding a specific "placeholder class" that can be extended in places
that will have text-based lists, like inside comment or topic text.
Deimos
a79223642e