One-Line Fix in nano: Flip a Config Flag

nano is the editor you reach for when you just need to change one setting and get out — no modes, no ceremony, the shortcuts are printed right at the bottom of the screen. This app shipped to production with debug logging left on. The config lives at /root/app.conf and contains the line 'debug = true'. Open it in nano, change that value to 'debug = false', and save. Grading checks the file, so any editor works — but this is the lab to get comfortable with nano's write-out (Ctrl+O) and exit (Ctrl+X).