Prepare for release, build on latest, remove a few old examples

Author: davetcc

.github/workflows/platformio.yml

@@ -19,12 +19,8 @@ jobs:
           # - examples/mbed/stm32f429FrameBuffer
           # - examples/mbed/stm32OledEncoder
           # AVR
-          - example: examples/avr/analogDfRobot
-            board: megaatmega2560
           - example: examples/avr/keyboardEthernetShield
             board: megaatmega2560
-          - example: examples/avr/nokia5110
-            board: megaatmega2560
           # ESP
           - example: examples/esp/esp32Amplifier
             board: esp32dev