Make setup ISO-only

Remove legacy online installer entrypoints, collapse migrations for 4.0, and move setup responsibilities into target-side system, hardware, and user commands.

bin/omarchy-webapp-remove

@@ -5,7 +5,8 @@
 
 set -e
 
-ICON_DIR="$HOME/.local/share/applications/icons"
+ICON_DIR="$HOME/.local/share/icons/hicolor/256x256/apps"
+OLD_ICON_DIR="$HOME/.local/share/applications/icons"
 DESKTOP_DIR="$HOME/.local/share/applications/"
 
 if (( $# == 0 )); then
@@ -32,8 +33,9 @@ if [[ -z $APP_NAME ]]; then
   exit 1
 fi
 
+icon_name=$(printf '%s\n' "$APP_NAME" | tr '[:upper:]' '[:lower:]' | sed 's/[^[:alnum:]]\+/-/g; s/^-//; s/-$//')
 rm -f "$DESKTOP_DIR/$APP_NAME.desktop"
-rm -f "$ICON_DIR/$APP_NAME.png"
+rm -f "$ICON_DIR/$icon_name.png" "$ICON_DIR/$APP_NAME.png" "$OLD_ICON_DIR/$APP_NAME.png"
 
 omarchy-notification-send -g  "Web app removed" "$APP_NAME"
 update-desktop-database "$DESKTOP_DIR" &>/dev/null