Added example with NextJS using PurgeCSS and Sass

[migramcastillo]

This is an example that I was working on with NextJS, Sass and PurgeCSS (if you want to have it without Sass please tell me). I'm not a native English speaker so any grammar check is welcome too!

[adamwathan]

Hey thanks! I just added an example of my own Next setup (just PostCSS, no Sass) but I wouldn't mind having a Sass example as well.

Here's the example I added, do you mind making the Sass one as close to that as possible, just with Sass added as well?

https://github.com/tailwindcss/setup-examples/tree/master/examples/nextjs

[migramcastillo]

Done! I also added how to use the PurgeCSS plugin for PostCSS that you have installed there as optional