Replace I38 installer with removal action

Change the configure-stormux menu from installing I38 to removing it, since new Stormux images now ship I38 by default.

Add a dedicated removal helper that disables nodm, removes installed I38/XLibre desktop packages when present, handles stale pacman locks safely, and optionally purges generated I38 user configuration.

Remove the now-unused architecture probe from the main menu script after dropping the GUI installation path.

.includes/remove-i38.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+if [[ "$(whoami)" == "root" ]]; then
+    msgbox "Please run configure-stormux as your user, not as root."
+    return 1
+fi
+
+sudoFlags=("${sudoFlags[@]}")
+
+confirmRemoval="$(yesno "This will remove the I38 desktop, disable GUI startup, remove the XLibre desktop packages installed for I38, and delete generated I38 configuration from your account. Continue?")"
+if [[ "$confirmRemoval" != "Yes" ]]; then
+    msgbox "I38 removal cancelled."
+    return 0
+fi
+
+sudo "${sudoFlags[@]}" systemctl disable --now nodm.service 2> /dev/null || true
+
+if [[ -f /var/lib/pacman/db.lck ]]; then
+    removeLock="$(yesno "A pacman database lock was found at /var/lib/pacman/db.lck. If no package manager is running, it is usually safe to remove. Remove it and continue?")"
+    if [[ "$removeLock" == "Yes" ]]; then
+        sudo "${sudoFlags[@]}" rm -f /var/lib/pacman/db.lck
+    else
+        msgbox "Cannot safely remove packages while the pacman database is locked."
+        return 1
+    fi
+fi
+
+packages=(
+    i38
+    cthulhu
+    nodm-dgw
+    xlibre-input-libinput
+    xlibre-video-dummy-with-vt
+    xlibre-video-fbdev
+    xlibre-xserver
+    xorg-xinit
+)
+
+installedPackages=()
+for packageName in "${packages[@]}"; do
+    if pacman -Q "$packageName" > /dev/null 2>&1; then
+        installedPackages+=("$packageName")
+    fi
+done
+
+if [[ ${#installedPackages[@]} -gt 0 ]]; then
+    yay --sudoflags "${sudoFlags[@]}" --noconfirm -Rns "${installedPackages[@]}"
+fi
+
+removeConfig="$(yesno "Delete generated I38 files from $HOME? This removes ~/.config/i3, ~/.xinitrc, ~/.xprofile, and ~/git/I38 if present.")"
+if [[ "$removeConfig" == "Yes" ]]; then
+    rm -rf -- "$HOME/.config/i3" "$HOME/.xinitrc" "$HOME/.xprofile" "$HOME/git/I38"
+fi
+
+msgbox "I38 removal is complete. Reboot before relying on the new console-only startup state."

configure-stormux.sh

@@ -62,9 +62,6 @@ fi
 source .includes/functions.sh
 # Include the dialog based UI
 source .includes/ui.sh
-# Get architecture
-architecture="$(uname -m)"
-
 # Make sure basic xdg directory structure is in place:
 if [[ ! -d ~/Desktop ]]; then
     xdg-user-dirs-update
@@ -99,8 +96,8 @@ while [[ "$choice" != "Exit" ]]; do
             yay -R --noconfirm linux-rpi
             install_package linux-rpi-16k
         ;;
-        "Install I38 Desktop")
-            source .includes/gui.sh i3
+        "Remove I38 Desktop")
+            source .includes/remove-i38.sh
         ;;
         "Screen reader")
             source .includes/screenreader.sh
@@ -139,7 +136,7 @@ while [[ "$choice" != "Exit" ]]; do
         if [[ "${raspberryPiVersion%%0*}" == "Raspberry Pi 5" ]] && ! pacman -Q linux-rpi-16k &> /dev/null ; then
             options+=("Install Raspberry Pi 5 kernel")
         fi
-        options+=("Install I38 Desktop"
+        options+=("Remove I38 Desktop"
         "Screen reader"
     )
         options+=("Set timezone"