Chore: Remove anything that looks like float or clearfix, replace with flexbox

[bhousel]

At this point we should probably just search for and remove all instances of float: left or float: right or anything that looks like a clearfix hack. These cause a bunch of problems, and most of the UI is flexboxed now.

These are legacy css tricks for getting content to flow around other content. Flexbox has been a thing since even the IE9 days, so there probably aren't many of these vestigial css rules left in the Rapid code. It is worth it for me to search for them and remove them to avoid surprises like the one fixed by a0ed2ca.

Originally posted by @bhousel in a0ed2ca