With thanks to @piotrb, Steven Moran and Menzo Windhouwer 
The https://linguistics-ontology.org/ is up again and the GOLD LD URIs work again, e.g. Genderal Ontology for Linguistic Description
Thanks for handling the technicalities, Dieter and Menzo! 
I’ve just tried to adjust the fairsharing.org entry for GOLD, but, gosh, Fairsharing is down.
I hope to come back to this around the 10th of July.