Deluxe spinning action

Notes:
- The spinning will not stop until you reload the page or open another one. I feel like we shouldn't implement a feature to disable it, since it's not really needed.
- This will affect ALL `<i>` tags across the site. This shouldn't be an issue, since all that's happening is a CSS class being added on, but we might want to eventually change this so it only looks for `<i>` tags that are actually being used for icons (via a Query selectors with regex or something like that).