Training video content is missing, leading to broken docs links

[sadielbartholomew]

The videos.html page of the documentation lists training videos with links to view them, but the video content is not there because it wasn't included in the tarball of the old documentation and needs to be located and added into the repo, else linked in from another location.

I have traced the content from Andy's hosted docs back to the following directory: https://github.com/ajheaps/ajheaps.github.io/tree/master/cf-view/videos. So I'll download that and upload to this repo in the right location.