I have updated the FvwmWiki
I am trying to make it a collection of info about Configuring Fvwm, along with example configurations. I even made it colorful with syntax highlighting of the Fvwm config format.
Feel free to let me know of anything you notice about the FvwmWiki. If you would like to contribute you can find the code on github.
Also if you know of any forum posts that would make a good page, you can share them here and I’ll see about adding them.