WIP DO NOT REVIEW: Simpler options menu

[sqs]

This is part of the Better config and deployment for code host UI integrations feature. I (@sqs) opened this so I could link it from elsewhere. @ijsnow please delete this preamble from the PR and update the title when you get to it.

This PR changes:

.

Testing plan:

I have tested on:

• Chrome
• Firefox
• Safari
• Phabricator Bundle

[chrismwendt]

Here's how to move this PR to https://github.com/sourcegraph/sourcegraph/tree/master/packages/browser-extensions

cd browser-extensions
git format-patch master --stdout > /tmp/patch

cd ../sourcegraph
cat /tmp/patch | git am -3 --directory=packages/browser-extensions/
# and fixup merge conflicts