Case: mount the display the right way up

The glass is 4.4 mm off-centre on the display PCB. Turning the display
180 degrees so the text reads correctly moved the glass partly behind the
window edge. New disp_rotated option (default on) moves the bezel bosses
to match. Only the bezel changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

case/README.md

@@ -61,6 +61,12 @@ check these against yours and change the values at the top of
 - `usb_pos`: where the micro-USB port is along the D1's back edge (38 mm from
   the jack side is a guess based on the UNO layout). Also check `jack_pos`.
 
+- `disp_rotated`: the glass is off-centre on the display's PCB, so the bezel
+  depends on which way up the display is mounted. `true` (the default) is the
+  orientation the display reads correctly in: turned 180° from the
+  datasheet's front view, with the jumper header on the left seen from the
+  front.
+
 If only the display is off, it's enough to reprint the bezel.
 
 ## Changing the design