Describe the bug
When applying a dark theme to the Docs page, the table still has white and light gray background colors. This obviously ruins the readability of the table as the text color is also a light gray. There is a hardcoded background-color: white; value applied to the table tr element.

To Reproduce
Steps to reproduce the behavior:

1. Use a dark theme for the docs page

By default ember-cli updates a number of the "app trees" to be from tests/dummy when developing an addon locally. We do this for app, styles, templates, public, and tests trees (handled inside lib/broccoli/ember-addon.js).

Unfortunately, we do not forward the apps vendor tree to tests/dummy/. This means that our addon's treeForVendor is called, but then subsequently clobbered by the "apps

Relevant conversation here: hjdivad/ember-m3#807

It got lost early in some v4 release candidate. Original content could be found here: https://github.com/kaliber5/ember-bootstrap/blob/b711738bba95fd9523e573e5e314f4cf7257f93f/addon/components/base/bs-button.js#L183-L191 It could be used as a starter.

Reported by @rwwagner90 here: kaliber5/ember-bootstrap#1110 (comment)