Improved Exercise Navigation

We just deployed some improvements to the exercise system which will make it
easier to get around.

First up, we added tabs to the top of the page so that you can jump back and
forth between the exercise overview and the list of solutions:

Also, in order to provide a better sense of progress, we added a three-step progress
bar to each exercise, as well as a new sidebar on the exercise overview page
which explains where you currently are in the exercise:

Let us know how the new navigation is working for you, and if you have any
suggestions, don’t keep them to yourself!

Happy coding!