Revert "Stop displaying SCSS files as pure CSS"
Revert "Stop displaying SCSS files as pure CSS"

This reverts commit 5e77154269db6119f2ed149e0a0d63e332ff68e8.

leo/leo.github.io,leo/leo.github.io,zhaoda/leo.github.io,zhaoda/leo.github.io,zhaoda/leo.github.io