refactor setup script to remove continuation flag handling and streamline installation steps

setup.sh

@@ -446,12 +446,6 @@ main() {
         exit 0
     fi
 
-    # Check if this is a continuation -c flag
-    if [ "$1" = "-c" ]; then
-        log_info "Continuing setup..."
-        CONTINUATION=true
-    fi
-
     # Check prerequisites
     check_prerequisites
 
@@ -461,14 +455,10 @@ main() {
         git clone "$GIT_REPO" "$DOTFILES_DIR" || die "Failed to clone dotfiles repository"
     fi
 
-    # Run setup steps
-    if [ "$CONTINUATION" != "true" ]; then
-        warning_prompt
-        prepare_hostname
-        check_selinux
-        install_nix
-    fi
-
+    warning_prompt
+    prepare_hostname
+    check_selinux
+    install_nix
     install_home_manager
     setup_symlinks