This reverts merge request !154168

To help make the migration process easier

Also add section about spacing and colors on official Tailwind docs
and update copy in danger rule

Warn against using them prompt to instead use the Tailwind equivalent

When a file is just moved around it appears in the changed files list
but the diff is empty so we are skipping it.

This adds a new Dangerfile to do some Tailwind-related reporting.
Currently, we check whether the diff potentially contains interpolated
CSS utils. We might extend this rule to report additional info about CSS
utils usages.