In commit 42f0740 I fixed config form button text styling by adding a

:not(.btn, .ink-c-button) to an a rule in .djblets-c-config-forms-page.

This ended up affecting the styling for config form nav items. When it

was previously just a plain a selector, it would tie with

.djblets-c-config-forms-page-nav__item then lose according to source

order, so the nav items had the right text styling. But now the :not()

makes it win over the nav item rule, so <a> nav items all have the

blue link text color now (which was apparent in Review Board's account

preferences sidebar menu).
This change moves the a:not(...) rule into

.djblets-c-config-forms-page__content. That way the rule still applies

to the content of config forms, and then sibling elements like the

navigation sidebar can define their own rules.

Viewed the account preferences page in Review Board and saw the

  sidebar text color was fixed.