make these linked to our github instead of copypaste

[ainsleys]

SecretContractExamples.md

[ainsleys]

Is there a way to do by linking to the actual code on github? cc @jlwaugh

i.e., not only do we want to have this include links to the actual code inside the demo repos, but ideally also have embedded code that reflects any changes made to the destination repos.

https://enigma.co/discovery-documentation/SecretContractExamples/