Add redirects for legacy pages that are linked from blog posts, etc. #183
Description
There are 48 flagged redirect "opportunities" here. Unfortunately, they don't really specify their sources, and I'm sure some of them are antiquated blog posts with very low readership.
We don't want to maintain a loooong list of redirects, so I think we should pick the most important ones (e.g. vaticle.com/slack.html > vaticle.com/discord) and implement only those.