This task encompasses the work to start transitioning Gruntfile.js tasks to package.json in both MinervaNeue and Popups repos. This task covers all simple transitions such as ESLint and creating tasks for what remains. Delete any relevant dependencies as you go and [[ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/MobileFrontend/+/master/package.json#3 | see MobileFrontend for reference ]] (T206069).
Before this enters the sprint board, the following boxes must be ticked!
 T206069 is completed and resolved.
 Developer notes have been fleshed out with any learnings from the experience in T206069
= Developer notes
 eslint is not using grunt
 stylelint is not using grunt
 jsonlint is not using grunt
 banana-checker is not using grunt
 grunt, grunt-contrib-watch and grunt-notify is removed from codebase