I would be interested to know why the Wiki was discontinued?
The wiki was a nice initiative of a group of users, which I appreciate a lot. It started very well as a community effort, and we provided the required infrastructure (hosting, wiki software and software maintenance). Unfortunately, it was abandoned some time after it was created. Without almost any updates and no clear direction to go after one year or so, I decided to discontinue it, mainly because it was giving a wrong impression of PixInsight as something not serious.
I do like the idea of a PixInsight Wiki. However, it has to originate and grow exclusively as a community-driven project. If necessary, we can provide all the necessary infrastructure, but we cannot invest human resources to generate wiki contents---we have to invest them in writing documentation, producing video tutorials, etc. If some users want to start a new wiki, I'd be glad to hear them.