Merge branch '57-email-link-to-settings-is-hardcoded' into 'development'

CHANGELOG.md

.../nl/tudelft/submit/controller/StudentGroupController.java

...va/nl/tudelft/submit/controller/SubmissionController.java

src/main/java/nl/tudelft/submit/service/EditionService.java

src/main/java/nl/tudelft/submit/service/GradeService.java

src/main/java/nl/tudelft/submit/service/ScriptService.java

src/main/resources/application.template.yaml

src/main/resources/mail/html/added_to_edition.html

src/main/resources/mail/html/default.html

src/main/resources/mail/html/grade_updated.html

src/main/resources/mail/html/group.html

src/main/resources/mail/html/submission_received.html

src/test/resources/application.yaml