It's not appropriate to be placed in any market forum because you aren't actually trying to sell anything. You're trying to advertise on ggFTW without prior consent of the ggFTW website owner, which is against the website's policy. So don't go posting another of those threads anywhere.
As you've likely read by this point, if you're looking to advertise an outside website without permission, a tasteful link in your signature is basically the limit (which I'm seeing you've already done). And there's kind of a slim line on that too, because we frequently have to crack down on accounts that were made specifically to advertise with links in the signature.
Since you're already an established member of the community, that shouldn't be a problem. But no advertising threads, and no soliciting any members by saying things like, "You should go check this out!" or whatever and then linking to the website.
This post feels long, but I think the point is pretty simple. If you're really going to do this, just take the utmost caution to follow the rules.