The .content div provides overall page margins and a max width, and is already nested inside the nav menus (this allows the nav background to fill the full width of the page.
The main content area should be structured the same way, so we can have flexibility needed to allow some screens to use the full page.
This doesn't seem to change the layout of any screens in the admin interface.
Now the table content can stretch full width
This way we can tweak the `fill` property of the SVG and style it with
CSS as the documented in the author's repo
(https://github.com/SamHerbert/SVG-Loaders)
> An icon's color can be manipulated by changing the fill attribute in
the SVG file.
For https://github.com/openfoodfoundation/openfoodnetwork/issues/3491
The spinjs-rails gem provides a CSS3 a spinning activity indicator. This commit removes the gem so we don't have to keep the gem up-to-date and uses the spinning-circles.svg which is used already in other places.
The spinjs spinner can be seen when viewing or editing taxonomies in /admin/taxonomies. It is loaded from the .ajaxStart call in app/assets/javascripts/admin/spree/progress.coffee
To test or restyle this spinner you can change the display property of the #progress element in app/assets/stylesheets/admin/components/progress.scss to 'block'.
