update installation message to instruct users to reopen shell and rerun the script after Nix installation

setup.sh

@@ -300,8 +300,8 @@ install_nix() {
         die "Failed to install Nix"
     fi
 
-    log_success "Nix has been installed. We're reinvoking the script to continue setup."
-    curl -L https://df.mvl.sh | bash -s - -c
+    log_success "Nix has been installed. Please open a new shell and re-run the script."
+    log_info "`~/dotfiles/setup.sh --continue` to continue setup."
     exit 0
 }
 
@@ -455,10 +455,15 @@ main() {
         git clone "$GIT_REPO" "$DOTFILES_DIR" || die "Failed to clone dotfiles repository"
     fi
 
-    warning_prompt
-    prepare_hostname
-    check_selinux
-    install_nix
+    if [ "$1" = "--continue" ]; then
+        log_info "Continuing setup..."
+    else
+        warning_prompt
+        prepare_hostname
+        check_selinux
+        install_nix
+    fi
+    
     install_home_manager
     setup_symlinks