Fix broken context.jsonld in examples
In all the yaml example data, it is using https://git.io/vf-examples-jsonld-context
. That unpacks to https://raw.githubusercontent.com/valueflows/vf-examples-jsonld-context/master/context.jsonld. Checking git.io, it says it is no longer accepting new links to shorten. When we moved from github, we changed the directory structure, and there is an abandoned context.jsonld file here: https://lab.allmende.io/valueflows/support-tools/vf-examples-jsonld-context/-/blob/master/context.jsonld?ref_type=heads. That one didn't get fixed for the new w3id structure, but it doesn't matter. We do have another context.jsonld file here: https://lab.allmende.io/valueflows/valueflows. That got fixed, but it probably isn't being used anywhere, certainly not in the examples.
We need to have only one. We need to add anything else needed for the examples, and cleanup for VF changes. We need to figure out where it should go, see if we can create some kind of more permanent url for it (w3id?). Then fix all the examples.
Adding here to not forget: run all the yaml through the validator.