TRS NS URIs do not agree with the spec

[berezovskyi]

See https://github.com/oslc-op/website-content-negotiation/blob/master/config/conneg.yml#L84-L107

@jamsden please check and comment here how shall we adjust the URIs.

[berezovskyi]

Jim confirmed the URIs of form /ns/core/trs are correct. We shall update the conneg and server settings.