Add note on how to build css to readme
Improve overall style
Light blue, pale main color
Beautiful image on home page
Merge branch 'master' of github.com:okfde/ckanext-offenedaten

Conflicts:
	ckanext/offenedaten/theme/fanstatic_library/styles/offenedaten.css
	ckanext/offenedaten/theme/fanstatic_library/styles/variables.less