wrong categorized wiki-entry

[frissdiegurke]

@julian or @psychobunny: Just noticed that you list Developing with Grunt and Coffee Script within Contributing to NodeBB Core.
It should be within Plugins and Widgets instead (even so you may also use it for theming)

[julian]

Please feel free to edit the wiki to fix this

[frissdiegurke]

xD, didn't know I have the rights to do so ^^
done.