Update images for the chapter 2 and 5 (Contao 3.0)
Update images chapter 5
Update images chapter 5 (Contao 3.0)
Modifications for better readability
Github import update
Custom module update

Typolight -> Contao
Links updated
Typo
...
Fixed postLogin and postLogout hook, they are also triggered in the backend!
Update 01-Installation.md
Update 02-Administration-area.md
Update 03-Managing-pages.md
Update 04-Managing-content.md
Added german translation
Merge branch 'github-update' into 3.0
Merge branch 'managing-content' into 3.0
Merge branch 'chapter-5-images' into 3.0
Dahunter -> Darunter
Merge branch 'images-updated-3.0' into 3.0
Revert "Update images chapter 5"

This reverts commit cf30b08476039a70692dc95675c8adb135ee0a79.
Merge branch 'chapter-5-images-3.0' of https://github.com/lionel-m/docs into 3.0
Merge branch '3.0' of https://github.com/lionel-m/docs into 3.0