long overdue update

Notes are now attached to work sessions instead of tasks. They can be
edited and deleted. Task work sessions can now be managed, their
duration adjusted if one forgets the button on.

Integrated Bootstrap 3, redesigned the thing entirely. It's kinda cool.

PDF reports are sort-of broken style-wise. Otherwise, this thing is
functional and looks a little bit too much better. I particularly
enjoyed dropping that Architect's Daughter type that was being used
publicly.