* Fix tabnav styles on #create and #edit views
The Primer CSS-provided `tabnav` styles were not being used on the Edit
and Preview tabs on the create and edit pages.
After following Primer's documentation [1], it looks like we were using
the `aria-current` attribute incorrectly. Dynamically adding/removing
this attribute on the selected tab fixes the issue.
[1]: https://primer-css-git-next-inputs.primer.now.sh/css/components/navigation#tabnav
* Recompile static assets
benjamin wil