move sitekey creation to the account creation function instead of during channel creation. Channel import bypassed sitekey creation completely. We should do it during install, but it's possible somebody might have to install manually and the sitekey would never get created. This is the best compromise I can come up with. Looks like the doc tree was also updated in this checkin
add a few missing doc pages
Merge https://github.com/friendica/red into zpull