remove auto-generated cruft
only run installation steps explicitly
convenience target for just building the app
get rid of coffee
make mynt depend on the app

IOW if the theme changes, rebuild the site
get rid of testing
get rid of autoprefixer (YAGNI)
attempt to join/conflate the app and site directory
move the blog to /blog
activate breadcrumbs for posts
fix the imprint
fix the blog post
cosmetics