Fix tailwind plugins by symlinking node_modules

[ekrem-qb]

No description provided.

[lukehutch]

This looks like it would almost fix my issue #15. However, in my case I don't have node_modules in my project -- tailwindcss finds ~/node_modules after hunting through parent directories. Also tailwindcss looks for package.json as an alternative to node_modules.

I think the best fix (as I mentioned in #15) is actually to simply create the temp dir in <project_root>/build/, to allow tailwindcss to use its usual logic to find node_modules and/or package.json.

However, perhaps the best solution of all, since there is only one output file per call to tailwindcss, is just to do the conversion in-place, and not even use a temp dir.