Create examples in docs pages

[ahwagner]

Please include links to examples from within concept/model pages, so it is easier to see instance examples of each class

[larrybabb]

@ahwagner if you want to mock up one or two of these then I will follow the lead and pitch in. If not, please let me know if you need me to take the lead on this. Also, let me know when this needs to be completed.

[korikuzma]

Will this just pull from our validation examples? https://github.com/ga4gh/vrs/blob/2.x/validation/models.yaml