I regularly end up on the unofficial NixOS wiki (https://nixos.wiki/) instead of the official one (https://wiki.nixos.org/) when doing web searches. Today I to proomted out this little bookmarklet that takes me from the unofficial to the official one:
javascript:(function(){window.location.href=window.location.href.replace('nixos.wiki','wiki.nixos.org');})()
A bookmarklet is a web browser bookmark that runs JavaScript instead of navigating you to a website. To use it, create a new bookmark in your web browser and paste the snippet above into the URL field. whenever you click the bookmark it will run the code.
Btw, I was trying to find a way to set something up that does this forwarding automatically for me but couldn’t find one that doesn’t involve installing a browser extension. If anyone knows how to do it “natively”, please let me know.

I run searxng locally and there is hostnames plugin ( https://docs.searxng.org/dev/plugins/hostnames.html ) to replace, remove or give high or low priority.