set up draft/review book

for teachers and TA's to review, let's have this online at mude.citg.tudelft.nl/book-draft/ can build from main once all tests are passed

can move to Phase 2 if needed

changed milestone to %Backend book support: Phase 1

added IT label

added status::review label

mentioned in merge request !24 (merged)

assigned to @rstular

this looks good to me, can close, right?

closed with commit e67a2c4f

mentioned in commit e67a2c4f