This way we won't have to add the `inline-block` and `no-bullet` classes
to other elements and we can define the styles in one place.
Note we're using the `ul.tags` selector instead of just `.tags` to avoid
conflicts with a `div.tags` selector which is used to select tags in a
form. Renaming the selector to `.tag-list` would be better, but we
aren't doing so because it would break custom stylesheets using that
selector.
Also note we're keeping the %tags placeholder selector in `.tags`
selector in the participation.scss file. This is so styles are not
overwritten by selectors like `.debate-show ul li`, which has the same
specifity as `ul.tags li`.
