docs: add board photos for the 2G5F4_10G2_V1.01 (HYWS-SGT0204S)

Top and bottom of the PCB plus the stock Bright Moon T25S40 flash chip, using
the doc/devices/photos/<device>/ layout of the other device documents.

doc/devices/2G5F4_10G2_V1.01.md

@@ -51,6 +51,18 @@ RTLPlayground image fills exactly.
 - A 3-hole reset button footprint is present but unpopulated, and the case has
   no opening for it, so there is no usable reset button
 
+Top side:
+
+<img src="photos/2G5F4_10G2_V1.01/pcb_top.jpg" width="600" />
+
+Bottom:
+
+<img src="photos/2G5F4_10G2_V1.01/pcb_bottom.jpg" width="600" />
+
+The stock flash chip, Bright Moon `T25S40` (SOP-8, 4 Mbit / 512 KB):
+
+<img src="photos/2G5F4_10G2_V1.01/flash_t25s40.jpg" width="300" />
+
 ### Port layout
 
 | Front panel position | Logical port | Physical port | Type    |