Move the add set form to the bootstrap design

Also, add an additional drop down with the categories, allowing the
user to filter the exercises, having all of them in a very long drop
down can be somewhat overwhelming and makes finding one specific one
difficult
Move the exercise overview to the boostrap classes
Make width of weight log chart depending on current width
Remove unused tinymce calls

The tinymce plugin is only used directly on the exercise edit page and
nowhere else.