Simplify tailwind install step

[woutdp]

I don't like it copies the entire file, while the important change is just one line. Ideally it changes the target tailwind file and adds the line, and if it can't find it, don't add it. And in addition add some instructions to setup tailwind yourself if you want.

[woutdp]

Instead of copying the file, we just now instruct to add something to the tailwind.config.js file. This is a bit nicer imo.