* ensure that eslint runs on all frontend code
* remove tslint from `design-system`
* enable prettier and eslint-prettier for `design-system`
* Delete tslint.json
* use a single editorconfig for the repo
* enable prettier for all code in `design-system`
* more linting fixes on design-system
* ignore coverage for git and prettier
* lintfix on editor-ui
* 📘 Fix type errors in design system
* 🔥 Remove unneeded `?`
* 🔧 Add design system to Vetur
* 📘 Improve typing of `$el`
* ♻️ Address feedback
* 📘 Type leftover `MouseEvent`
* 📘 Type `event.target` properly
