Tag Alias: hold -> holding

I don't think there any difference between hold and holding.

Yeah; removing the 'hold' tag, and then aliasing/normalizing it to 'holding' tag sounds like a good idea.

I'm up for it.

A good number of the hold/ing images look like they would be better served with carrying.

But that's a separate matter from whether we alias this, and yes it should be holding. Done.