I know here is an explanation for branches https://docs.turris.cz/geek/testing/
and here is a link to the latest version of HBS https://docs.turris.cz/hw/omnia/rescue_modes/#re-flash-router (and I assume the link is up to date)
But if I enter the repository manually https://repo.turris.cz/ I don’t know where to look 
What’s the difference between the following files?
https://repo.turris.cz/hbs/medkit/
https://repo.turris.cz/omnia-stable/medkit/
https://repo.turris.cz/omnia/medkit/
Best Regards!
Andrew