Basic 'Stats' button so users can see where the homepage stats come from

A simple Stats button should appear under the stats section of the homepage and link to this post: Stats and Links

Please make this link editable in i18n as the stats will be on a different url for BTM
(all user visible text should be written and then pulled from i18n, there’s an i18n guide in the documentation category)

This is a temporary measure to allow users to see where the stats come from, before we build the pop up modals into the homepage which will contain this data.