Fix most NPM audit alerts

[snowteamer]

Summary of changes:

• Remove unused local grunt (we are only using a globally installed grunt).
• Bump browser-sync to 2.27.7.
• Uninstall unused cheerio and chokidar (however they are still there as sub-dependencies).
• Bump mocha to v8.4.0.
• Bump eslint to v7.32.0.
• Remove eslint-plugin-standard as suggested in the following notice:

npm WARN deprecated eslint-plugin-standard@5.0.0: standard 16.0.0 and eslint-config-standard 16.0.0 no longer require the eslint-plugin-standard package. You can remove it from your dependencies with 'npm rm eslint-plugin-standard'. More info here: standard/standard#1316

• Replace babel-eslint with @babel/eslint-parser as per notice:

npm WARN deprecated babel-eslint@10.1.0: babel-eslint is now @babel/eslint-parser. This package will no longer receive updates.

• Bump eslint-plugin-vue to v7.20.0

• The number of audit alerts has been reduced from 37 (13 moderate, 19 high, 5 critical) to 12 (12 high).
  This is still quite a lot, however they all seem to arise from only two packages, namely set-value and union-value. From the dependency graph displayed by npm audit it looks like fixing these remaining issues would involve either patching check-dependencies' or forking grunt-check-dependencies', in order to update their vulnerable `findup-sync' sub-dependency.

[taoeffect]

Approved! Excellent PR @snowteamer!