assessment for contributions works from download to upload. Calculating a mean for docent-view and the docent-view itself is missing.

The header format was not present in the object, because the header
format is just added to the hidden character after the header itself.
To fix the problem, the format is added manually.

- removed unused code
- adding todos for the class

added second hidden editor, so editor is visible all the time and also
improve implementation to set the correct text to quill

you can upload pptx and pdf, they are not correctly stored yet. from website to DAO it works though.