Handling of `dir` html attribute

[TheAlexLichter]

What problem does this feature solve?

When using text-start/text-end in CSS and using the default transpile settings, the CSS will be transpiled to a version relying on the dir attribute of the HTML tag (or lower tags) (see nuxt/nuxt#4555).

We should list/document such caveats somewhere

[debs-obrien]

Thanks for your contributions. We are now closing this repo as docs have now moved to nuxtjs.org using content module. Please continue your contributions on that site especially focusing on the guides folder which is the new docs. Thanks

https://github.com/nuxt/nuxtjs.org/blob/master/README.md