Reorder the dark-theme.css file

@yas, please review this patch. This fixes the ordering issue with dark-theme.css. I'm forcing it to be rendered after all the bootstrap libraries are declared.

Also, I fixed the issue with jquery.once. In global.js, there were still references to jquery.once which has been deprecated for drupal/once. This code was causing Javascript errors and the "tabs" on the dashboard were not working.

@yas, I fixed the ESLint errors. Please review when you get a chance.

@baldwinlouie

Thank you for the fix. I’ll merge the patch into 6.x and 7.x; and close this issue as Fixed.

Automatically closed - issue fixed for 2 weeks with no activity.