feat(nixos): deploy Gitea guest on Pikachu

configs/nixos/README.md

@@ -102,7 +102,7 @@ Confirm you have connectivity (`ping -c1 github.com`) before continuing.
 Clone the monorepo onto the live ISO and work from that local checkout:
 
 ```console
-$ git clone ssh://gitea@git.alexion.dev:2022/alexion/dev.git
+$ git clone ssh://gitea@git.alexion.dev/alexion/dev.git
 $ cd dev
 ```