Some changes in the template (+ dummy data)
Merge branch 'dev' of github.com:INSA-4IF-SpecIFic/elif into dev

Conflicts:
	src/templates/exercise.html
Fixed some inconsistencies

ex: Using POST to get data, showing "Save" and "Publish" to normal users, etc.
Merge branch 'dev' of github.com:INSA-4IF-SpecIFic/elif into dev