Unity Exporter page is out of date and has broken links

[SimonDarksideJ]

Using the Unity Exporter page today, I found numerous errors:

https://github.com/BabylonJS/Documentation/blob/master/content/resources/Unity/Projects.md

• Missing a fair amount of the required configuration (which show up as warnings with the latest eporter)
• The "Getting Started" video link is broken (in fact the whole babylontoolkit website is down)