Adds commentary, keyboard navigation and useful info to the pages of Homestuck.com stories.
Homestuck Companion currently displays ACT 1 and ACT 2 commentary for Homestuck, complete commentary for Problem Sleuth and enables keyboard navigation for both.
To use: just go to a supported URL like "https://www.homestuck.com/problem-sleuth/10" or "https://www.homestuck.com/story/513" and behold the commentary.
Keyboard controls work on every page of Problem Sleuth and Homestuck.
