Add time slot numbers to start of documentation rows

there:

with optional dependency to lesrooster

changed milestone to /AlekSIS%"[NLnet #3] Test and review with pilot schools"

added part::frontend source::customer::kath type::feature labels

assigned to @hansegucker

created branch 302-add-time-slot-numbers-to-start-of-documentation-rows to address this issue

mentioned in merge request !390 (merged)

mentioned in commit d036e064

closed with merge request !390 (merged)