bringing lesson instructions back
instructions are sequential
instructions go forward and back...as they should.
clean up lessons
more instructions
add more instructins for Learn More. And fix the play/pause/playbackRate issue
make filter buttons dynamic and dependent on which instruction step is displayed
added routes for csweek
changed 'retun to editor' button to direct to csweek page, not normal lesson page
added Mixpanel tracking for Learn More
removed logging
merge