refs #24353 [finc] update grunt node and dependencies

* delete npm-shrinkwrap
* adapt gruntfile due to newer version of node-sass
* add option sass
* add option sourceMap
* sync with dev regex in config
* ignore compiled.css.map
* update package.json, package.lock and composer.lock due to grunt and node-sass
* exclude sandal theme from build and watch
* extract docker image and install to separate Dockerfile
* exclude sandal theme from build and watch