deploy `CIM-ontology-context.jsonld` on a network location

[VladimirAlexiev]

• The first cut of #99 was done with a local file file://CIM-ontology-context.jsonld . The output includes the same relative URL, which is not good.

  "@context": "file://CIM-ontology-context.jsonld",

• We cannot use github directly (https://github.com/Sveino/Inst4CIM-KG/raw/refs/heads/develop/rdfs-improved/CIM-ontology-context.jsonld) because it doesn't serve the appropriate content type
• So we currently use rawgit2 (https://rawgit2.com/Sveino/Inst4CIM-KG/develop/rdfs-improved/CIM-ontology-context.jsonld), which serves the file with content-type: application/ld+json. This works, but it's not a permanent location, so we need to look for a better location. It should be updated automatically when the github file changes.

For the ontologies, we could embed the context by using techniques described at GS1 EPCIS. But for instance data we definitely need a network context, so we better find a solution.

[VladimirAlexiev]

@Sveino wrote:

• The www.model4powersystem.eu domain intends at referencing the power system models, or Individual Grid Model (IGM) and Common Grid Model (CGM) as stated in the network code.
• The www.cim4.eu domain is though to refer structure metadata that describe classes, attributes and association and organisation and relationship within a dataset to form an information model or ontology.
• The www.referencedata.eu will be used for referencing instance data that is common for one or more business process in a semantic web structure and format (e.g., referencing the electrical market bidding zone).