Split constant and dictionaries among each django app

Right now all constants and dictionaries are located in the canvas folder. They should split up so each django app contains only the constants and dictionary it needs

Start by inventorying the constants and dictionaries currently in the canvas folder, then identify which Django app uses each one. Move them so each app contains only the values it needs, and verify that the resulting organization matches the issue’s requirement without leaving shared values misplaced.

Written by the indexing model from the issue text.