Rename enonce and exercice to assignment and exercise

.gitlab-ci.yml

NodeApp/package.json

NodeApp/src/commander/CommanderApp.ts

NodeApp/src/commander/assignment/AssignmentCommand.ts

NodeApp/src/commander/assignment/AssignmentCreateCommand.ts

NodeApp/src/commander/assignment/AssignmentPublishCommand.ts

...ander/assignment/AssignmentPublishUnpublishCommandBase.ts

...pp/src/commander/assignment/AssignmentUnpublishCommand.ts

NodeApp/src/commander/enonce/EnonceCommand.ts

NodeApp/src/commander/enonce/EnoncePublishCommand.ts

NodeApp/src/commander/enonce/EnonceUnpublishCommand.ts

NodeApp/src/commander/exercise/ExerciseCommand.ts

NodeApp/src/commander/exercise/ExerciseCreateCommand.ts

NodeApp/src/commander/exercise/ExerciseRunCommand.ts

NodeApp/src/config/Config.ts

NodeApp/src/managers/DojoBackendManager.ts