Add videos or animated gifs to the site

[cdmgtri]

Add videos or animated gifs to the site to demo certain features or walk users through the training information. This could be used for things like how to use the SSGT or the IEPD developer training.

[cdmgtri]

Look to see what we can reuse from the updated NIEM IEPD developer training. May be able to link to short video segments on partiular topics.