Update re Show HNs

We're temporarily restricting Show HNs because of a massive influx, mostly by users who aren't yet familiar with the site or its culture. You're welcome on HN! Take some time to get to know the community, become a good contributor, and then it will be fine to post an occasional Show HN. Here are some links to get you started: https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/newswelcome.html https://news.ycombinator.com/showhn.html