Squashed 'LibraryBox-landingpage/' changes from 6b317b5..f2360f5

f2360f5 Fixed the absolute link for about.html
7431fa9 fix in link to about.html

git-subtree-dir: LibraryBox-landingpage
git-subtree-split: f2360f5d1103705063d4ffb1533b79340f020d06
Merge commit '23202a91d31e0734314bdb075ce43abb06445c4b' into development
added new subtree repository LibraryBox-landingpage to doumentation
Version Tag vor beta2