Links on the volunteering page related to Tor sub-projects are outdated/broken/suboptimal

Some URLs had (or were missing) trailing slashes which resulted in redirects.
All of the "bug tracker" links to the Tor trac were using old component names and have been updated.
The domain previously hosting the Incognito project website appears to have been taken over by a domain squatter, the link has been replaced with an archive.org link.
The homepage for Shadow is now hosted on GitHub, the umn.edu site has a redirect in place currently.
The ExperimenTor website is now available using HTTPS.
The txtorcon documentation is hosted on readthedocs which now uses a .io domain for the hosted documentation instead of the .org.
OONI now uses GitHub for code hosting and issue tracking.
The panopticlick PDF file on the EFF website has changed URL (the old URL producing a 404).