Add PurgeCSS comments to tailwind.css

[pspeter3]

I often end up having a single css file for Tailwind projects with the below contents. It would be nice if the tailwind.css file could include those comments by default. That way I can just import "tailwind/tailwind.css" in my code and not need the CSS file.

/* purgecss start ignore */
@tailwind  base;
@tailwind  components;
/* purgecss end ignore */

@tailwind  utilities;

[taylorbryant]

#1639 integrates PurgeCSS directly into Tailwind

[pspeter3]

Yeah, I think this is made redundant by #1639