fix(installer): keep the cloned remote on HTTPS

A freshly installed machine has no key on Gitea, so the SSH remote the
installer set turned the first `git pull` into a password prompt.

hosts/installer/default.nix

@@ -35,10 +35,11 @@ let
       user=$(nix eval --raw "/etc/moonix#nixosConfigurations.$host.config.moonarch.user")
       owner=$(awk -F: -v u="$user" '$1 == u { print $3 ":" $4 }' /mnt/etc/passwd)
 
+      # HTTPS, not SSH: a freshly installed machine has no key on Gitea, and an
+      # SSH remote would ask for a password on the first `git pull`. Switching
+      # the remote is a step for later, once a key exists — see README.
       git clone https://gitea.moonarch.de/nevaforget/moonix.git \
         "/mnt/home/$user/flakes/moonix"
-      git -C "/mnt/home/$user/flakes/moonix" remote set-url origin \
-        git@gitea.moonarch.de:nevaforget/moonix.git
       chown -R "$owner" "/mnt/home/$user/flakes"
 
       mkdir -p /mnt/etc/nixos