Stony Silence only prevents activated abilities of artifacts from being activated. Equipment can still be attached to creatures as long as you aren't activated an ability of an artifact to do so. Sigarda's Aid has a triggered ability that equips an equipment, so it still works properly. Auriok Windwalker is not an artifact and has an activated ability that attaches equipment, so it also allows you to do so. Thornbite Staff is an equipment with a triggered ability that attaches itself to a creature, as it is not activated, it will still be able to attach itself. Anything that functions like one of these three cards will circumvent the restriction, as the restriction is very specific in what it stops.