Revert "Merge pull request #77 from StylishThemes/restore-octicon-colors"

This reverts commit 225d25ab2320573e027b764e79c5e41980e45cf7, reversing
changes made to 9e78e668a2f9acdedb6f907a57fb4edbf579484d.
Merge pull request #80 from StylishThemes/revert-#77

Revert "Merge pull request #77 from StylishThemes/restore-octicon-colors...