Invalid markup - Dashboard

[tdy]

Dashboard URL: https://classtranscribe.ncsa.illinois.edu/dashboard

Two markup errors with the Courses <button>:

1. Remove the self-closing slash
2. Fix type="add" to a valid value (or remove)

[tdy]

classTranscribe/templates/dashboard.mustache

Line 26 in 67f4e0a

<button type="add" class="add" onclick="window.location='/courses';"/> Courses </button>