Adjust URLs to github URLs.

[eugenk]

This adjust the URLs to point to this github repository instead of rightsrestricted.com.

[eugenk]

This is needed for ontohub/ontohub#1569

[0robustus1]

Are you sure that this is a good idea? this will always point to the current version. So it might be hard to keep in sync with the actual state of the ontohub implementation unless they are always at the same state (which is hard to maintain). I would suggest to at least employ some versioning (e.g. tagging) here, or to use ontohub to host the current canonical, or to have a specific branch that always points to the currently implemented ontohub state.

[eugenk]

So it might be hard to keep in sync with the actual state of the ontohub implementation

Right, this can only be maintained if we have a copy of the schema files in the main ontohub repository. Did not think of that.

[0robustus1]

That is probably an even better idea.