Moved WordPress and Now Can't Log In

[Title amended]

I just moved a site from a subdirectory on my domain to a root folder on its own domain. I did have at least the home page now I don’t even have that. https://www.projectreconnect.net.

Now I can’t even login to the backend. All I did when I lost both was to change the site url in the back end.

Also when I look at the code I have weird code that looks like everything is linked to another site I have. If I try to change those links it does nothing.

Any body have any ideas?