see https://vue-loader.vuejs.org/options.html#transformasseturls

* now implements aria-role for sliders instead of readonly progress
* add keyboard and knob-drag seek support

* add caching for immutable resources
* split-up nginx server configuration for docker and static assets
* move dist into build directory
* rename docker image

we’re fine with a more narrow set of supported browsers

add Dockerfile for gitlab auto devops

See merge request lohro/lohrothek/saumselig!1