Rofi Menu Back and Quit Options & Startup Script in Control Center

- Add startup processes script to control center
- Add a "back" and "quit" rofi menu option where back exits
  current menu, leaving the option to return to previous
  menu that called it. Quit kills all rofi processes.

.scripts/startup.sh

@@ -65,13 +65,16 @@ rofi_menu() {
         "羽 Launch Delayed Processes - delay"
         " Kill Startup Processes - kill-startup"
         " Kill Delayed Processes - kill-delay"
+        " Back - back"
         " Quit - quit"
     )
 
     choice=$(printf '%s\n' "${options[@]}" | rofi -dmenu -i)
     option=$(printf '%s\n' "${choice}" | awk '{print $NF}')
 
-    if [[ "$option" != "quit" ]]; then
+    if [[ "$option" == "quit" ]]; then
+        kilall rofi
+    elif [[ "$option" != "back" ]]; then
         main "--$option" && main "--rofi"
     fi
 }