Revert "VimCheatSheet: Fixes #444"

This reverts commit cd4d95b2e4fe0584d35e451ed1bdccd1c5a7e5dc.
Vim Cheat Sheet: Change from `id` to `class`
Merge pull request #467 from duckduckgo/jag/vim-css

Vim Cheat Sheet: Add back style.css