removed references to hideOnMobile in column_link and getting_started (#6082)

* removed references to hideOnMobile in column_link and getting_started

* move keyboard shortcuts back below blocked users

app/javascript/mastodon/features/ui/components/column_link.js

@@ -26,7 +26,6 @@ ColumnLink.propTypes = {
   to: PropTypes.string,
   href: PropTypes.string,
   method: PropTypes.string,
-  hideOnMobile: PropTypes.bool,
 };
 
 export default ColumnLink;