Remove init.js, move required functionality to relevant files

Removes the old init.js, moves relevant code to relevant files.  To test:

1.  Ensure that on the "new document" page, the slug is properly formatted with title changes (i.e. no slashes, or $ are allowed)

2.  Ensure that the wiki pages work as they should (i.e. subnav toggles, TOC scrolls, etc.)

3.  Forms are disabled upon submission.