Allow formatted input and extra links for homework and lesson documentation

changed milestone to %1.0a1

added part::backend part::frontend prio::1 source::customer type::feature labels

added prio::2 label and removed prio::1 label

Also include a homework overview

That's definitely not a part of this issue. Please open a new issue for it.

changed title from Allow formatted input and extra links for homework to Allow formatted input and extra links for homework and lesson documentation

assigned to @ZugBahnHof

unassigned @ZugBahnHof