Umbrella task for transitioning Gruntfile.js tasks into npm scripts in different projects.
A detailed template for the process: {T246326}
==== Projects
[] Core
===== Skins
[x] T242781 Vector
[x] T206069 MobileFrontend42781 Skin:Vector
[x] T206462 Popups, MinervaNeue069 MobileFrontend
[] T266977 MediaViewerT206462 Popups, Skin:MinervaNeue
[] TimelessT266977 MediaViewer (MMV) - [[ https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MultimediaViewer/+/574636 | patch 574636 ]]
[] MonoBookSkin:Example
[] ModernSkin:Timeless
[] Example
===== Extensions
[] T245930 MediaViewer (MMV) - [[ https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MultimediaViewer/+/574636 | patch 574636 ]]Skin:MonoBook
[] ...Skin:Modern
==== Previous related tasks
{T179195}
{T204176}
{T204260}