Update README with a finished product

Author: Deni90

README.md

@@ -115,14 +115,9 @@ Maybe in the future I decide to upgrade the project to use **ESP32**.
 
 ![control board schematic](doc/cbSch.jpg)
 
-#### PCB
-
 **IMPORTANT**: For some reason (bug) the wiring of the SMD crystal is wrong. XI and XO pins are located diagonally. To fix this issue after calling "Update PCB from Schematic..."(F8) it is needed to manually change the layout of Y1 to:
 ![fix](doc/crystalFix.png)
 
-![control board top](doc/cbTop.png)
-![control board bottom](doc/cbBottom.png)
-
 ### Display board
 
 Display board uses a CD4028 BCD-to-decimal decoder. Its purpose is to reduce the number of required GPIO pins from 10 to just 4 for showing digits from 0 to 9. Compared to dedicated BCD to decimal decoder nixie drivers (like K511ID1), the CD4028 is a widely spread component and it is available in SMD package. Since CD4028 has a voltage range from 3.0V to 15V it is not compatible with nixie tube’s operating voltage of 170V out of the box. This problem is solved with MMBTA42, a high voltage transistor, rated to more than 200V.
@@ -133,11 +128,6 @@ The rest of the display board consists of a WS2812B RGB LED and a pin header use
 
 ![display board schematic](doc/dbSch.jpg)
 
-#### PCB
-
-![display board top](doc/dbTop.png)
-![display board bottom](doc/dbBottom.png)
-
 ## PCB manufacturing
 
 A representative from **PCBWay** contacted me because he was deeply impressed by my project and offered to sponsor a batch of PCBs to test out their services.