fix(headscale)!: Rename 'url' to 'domain'

This better reflects the value which goes in the option by removing
confusion about if the protocol should be included

Change-Id: Ib550eb97b96999a733c07915c8738a337546ec52
Reviewed-on: https://git.clicks.codes/c/Infra/NixFiles/+/790
Reviewed-by: Samuel Shuert <coded@clicks.codes>
Tested-by: Skyler Grey <minion@clicks.codes>
diff --git a/systems/x86_64-linux/teal/default.nix b/systems/x86_64-linux/teal/default.nix
index 40a0066..6d5ffcc 100644
--- a/systems/x86_64-linux/teal/default.nix
+++ b/systems/x86_64-linux/teal/default.nix
@@ -40,7 +40,7 @@
       ssh.enable = true;
       headscale = {
         enable = true;
-        url = "clicks.domains";
+        domain = "clicks.domains";
         oidc = {
           enable = true;
           issuer = "https://login.clicks.codes/realms/master";