remove *difficult* boards

Author: gigapod

.github/workflows/compile-sketch.yml

@@ -67,14 +67,6 @@ jobs:
               - name: esp32:esp32
                 source-url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
 
-          # Artemis / Apollo3  Feb 25 - there some issue here -- will need to look at 
-          # https://github.com/sparkfun/Arduino_Apollo3/blob/main/boards.txt
-          - fqbn: SparkFun:apollo3:sfe_artemis_atp
-            name: SparkFun Artemis ATP
-            platforms: |
-              - name: SparkFun:apollo3
-                source-url: https://raw.githubusercontent.com/sparkfun/Arduino_Apollo3/master/package_sparkfun_apollo3_index.json
-
           # ESP8266
           # https://github.com/esp8266/Arduino/blob/master/boards.txt
           - fqbn: esp8266:esp8266:thingdev
@@ -83,22 +75,6 @@ jobs:
               - name: esp8266:esp8266
                 source-url: https://arduino.esp8266.com/stable/package_esp8266com_index.json
 
-          # SAMD21
-          # https://github.com/arduino/ArduinoCore-samd/blob/master/boards.txt
-          - fqbn: arduino:samd:mkr1000
-            name: SAMD21 MKR1000
-            platforms: |
-              - name: arduino:samd
-                # source-url: https://downloads.arduino.cc/packages/package_index.json
-
-          # Nano BLE 33 / nRF52840
-          # https://github.com/arduino/ArduinoCore-mbed/blob/master/boards.txt
-          - fqbn: arduino:mbed:nano33ble
-            name: Nano BLE 33
-            platforms: |
-              - name: arduino:mbed
-                # source-url: https://downloads.arduino.cc/packages/package_index.json
-
           # RP2040
           # https://github.com/arduino/ArduinoCore-mbed/blob/master/boards.txt
           - fqbn: rp2040:rp2040:sparkfun_promicrorp2040