Consider adding an explicit position for the Analytics dashboard page menu item

When the plugin is activated on a multisite, the Analytics dashboard page menu item is after the menu item ‘My Sites’. This can be a bit confusing since the analytics are for the current site.

Adding an explicit position of < 5 to [`add_dashboard_page()`](https://developer.wordpress.org/reference/functions/add_dashboard_page/) would place it before ‘My Sites’.