Instead of always displaying the readme file, now a button will allow
you to display and hide the readme file.

Closes #49
Created a friendly button to display and hide the readme file.

The other one was just too ugly!
Added a way to get to /tree.

Now there's a button to get there.
The button matches the hide/display readme buttons.
Maybe more buttons will come in the future.
Also removed a period (.) from "Display README file."
Also removed a period (.) from "Hide README file."

Closes #61
Merge branch 'development' of github.com:SashaCrofter/grove into development