Revert "css"

This reverts commit 24f1a7bec646f117822f0888d669e9017c75ef30.
CSS

Changed responsive CSS
Einkaufen Profil and Main
Merge branch 'dev_play_basti3' of https://github.com/toschill/buechern into dev_play_basti3
CSS

Changed to HTML 5 Tags
Logo now links to Startpage
Startpage Picture is now set to 60% width on big screen and 100% if
screen smaller than 750px
CSS

CSS updates.
Buchboxes now got a max height of 370px which allows to use 2 more rows
of Text for title or for autor.
Cleaned CSS and placed some Comments for better understanding
Merge branch 'dev_play_basti3'