Supporting inlining tailwind-css

As far as I understand, we can currently either use `tailwind-css` or `inline` for `rel`. It would be nice if we could use both together, so that tailwind can regenerate .css file and it can be inlined in the .html file. For instance: ```html <link data-trunk rel="tailwind-css inline" href="tailwind.css"> ``` Note that `rel` attribute must have a value that is an unordered set of unique space-separated keywords: https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/rel