Adapt path to images
Create a single pdf for the git exercises
Add exercise slides to push
Add skeletons for push exercises
Don't mention Gerrit
Add screenshots for github
Write text in fork exercise
Add text to the push exercise
Add text to the fetch-rebase-push exercise
Adapt the overview pages
Add github exercises to slides
Small improvements
Add tag slides
change screenshots in clone exercise
change landscape overview pics
fixes the Agenda which was broken with 35af67afb76c370ec6952da4c77c709686650703