add live-server

[maxlath]

Not sure in which category to put it, but live-server is easily in my top 5 npm scripts utilities. Typically used to develop minimalist static pages lacking their own live-reloading servers like Github Pages. example

[RyanZim]

Yeah, I've used that in the past too, just somehow forgot to put it on the list. Thanks for bringing this up!

PR welcome, make a new "Dev Servers" category. Could also include https://github.com/indexzero/http-server for when you don't want/need live reloading.