Revert css preloading
The css preloading was removed in the following MR: !79 (merged), This wasn't everything related to the feature though. It's really important that the following line gets removed as well:
'onload' => "this.onload=null;this.rel='stylesheet'",
Otherwise the stylesheet won't resolve correctly onload , and this will cause a flash of unstyled content.
the no script tag is a fallback for this onload functionality, so in the rare case the user doesn't have js enabled, the styles would still load. But since the onload functionality isn't used anymore, this can also be remove for now.
The original MR: !78 (diffs)