W3id context files have incorect media type in the content-type response header

[lecoqlibre]

When querying context files like https://w3id.org/dfc/ontology/context/context_1.16.0.json or https://cdn.jsdelivr.net/gh/datafoodconsortium/ontology@2.0.0/context/context_1.16.0.json we get a content-type header value of application/json instead of application/ld+json.

Even if a JSON-LD document is a valid JSON document, the media type MUST be application/ld+json as parsers are waiting for a JSON-LD document.

Also the extension of the context files should be renamed to .jsonld.