As you may be able to see, the template, which largely controls what the site looks like (i.e. the style), has changed. What's less obvious is that the core Content Managmement System (CMS) software has been updated to the current supported version. The content (articles, documents, videos, links, etc.) remains unchanged.
In general I've tried to keep the side bar content the same and in the same positions as with the old template. Sadly we have lost the 'hamburgers' (i.e. a down arrow, which indicates a sub-menu) on the main menu. I'll continue to investigate to see if I can get these back.
I've done some testing, but it's always possible I've missed something, so if something does not work in the way you think it should, please let me know.