Remove postcss imports

[oscarotero]

According to migration guide, the Step 4 recomends to remove the postcss imports and use the second argument of the Root function.

This is not the case of process-content.js file: https://github.com/postcss/postcss-import/blob/master/lib/process-content.js#L7

I think the processContent function should have another argument for that, in order to remove the direct import. This would be very helpful for the Deno version, to avoid loading two different versions of postcss.

[RyanZim]

Agreed, PR welcome.

[oscarotero]

Done!