change pulldown toggler
Add *fake* search box to header
Simplify «application preview», with a simple ribbon
Make footer light & transparent on mobile devices
Move stuff to impressum on mobile.html
attach impressum to accordion parent’s group, remove light theme from it
on mobile, integrate pulldown’s toggler into navbar
fix pulldown position on middle breakpoint
Remove unneeded wrapper div
Remove unused CSS classes
adapt pulldown’s toggler to font awesome
header cosmetics (closer to design)