Remove sass-lint

Too many security vulnerabilities in deeper dependency levels is heavier than having an (anyway optional) scss linting in place

Author: netzartist

client/README.md

@@ -15,7 +15,6 @@ To contribute to the further development, see section "Contributions welcome!" f
 - [Angular](https://angular.io/) as single page application framework
 - [Jest](https://jestjs.io/) as unit testing framework
 - [Prettier](https://prettier.io/) as pre-commit-hook
-- [SASS Lint](https://github.com/sasstools/sass-lint) to check scss files
 
 See package.json for up-to-date version information.