Merge branch 'submission-notes' into 39-a-new-student-overview-page-with-vue-js

frontend/config/index.js

frontend/index.html

frontend/package.json

frontend/src/App.vue

...d/src/components/submission_notes/AnnotatedSubmission.vue

frontend/src/components/submission_notes/FeedbackComment.vue

frontend/src/components/submission_notes/FeedbackForm.vue

frontend/src/main.js

frontend/src/router/index.js

frontend/src/store/api.js

frontend/src/store/modules/submission-notes.js

frontend/src/store/store.js

frontend/yarn.lock