Add a "connected with" relationship to indicate a connection between indicators

[dgarijo]

For example,
https://w3id.org/everse/i/indicators/repository_workflows and https://w3id.org/everse/i/indicators/software_has_ci-tests are connected (one is more specific than the other), or https://w3id.org/everse/i/indicators/dependency_management and https://w3id.org/everse/i/indicators/requirements_specified (if more loosely).

Showing that there is a connection between indicator is important, as sometimes they have a partial overlap