Removed $ character for easy copy/paste

As a new user, when attempting to install Brubeck, I cannot easily copy/paste some of the lines into my terminal from the browser, requiring me to copy/paste one line at a time or remove everything by hand.

It would be nice to make the '$' characters visible but not copy/paste but I can't think of an easy way to do that (besides making them images which feels to hack-y).