increase ParticipantDataController spec coverage to 100% [Finishes #75925652]
optimized learning_tasks query
users can now add a new activity [Finishes: #75836704]
make ratings suggested for DO #2 [Finishes #75723662]
Changed the column ratio to 3-9 for the tool pages and fixed the input boxes on the login page. [Finishes: #75908362]
integrate activity viz [#75587340]
add images to public folder [#75984340]