Well that was easy.
Open up Tor Browser and go to my #Nitter instance:
https://bluebird.codeine.world
It should automatically redirect you to the new onion site:
kjt25r7mmezdj2zv2sin7fut74ao6ziz5zb3w5s7o7nhfy2riovbhlad.onion
Ofc you can just paste the #onion URL direct into #Tor as well, but I thought it was cool how it auto redirects (if you set up an HTTP header).
Haven’t set one up for Pleroma because Soapbox needs JS to run and I don’t wanna encourage people to enable JS in Tor.
Actually quite an interesting topic, setting up a #hiddenservice, gonna write a blog post about it.
Obviously this is a basic setup designed for providing an onion service to a public clearnet site. If you wanted to setup an anonymous darknet server there would be many more complex OPSEC considerations when configuring and running it.
But in my case the main URL goes straight to a clearnet site anyway so no bother.