Remove the fragile and heavy json libraries from the firmware, remove JSON topics on MQTT, remove JSON Logging/Tracing, replace JSON output on webserver with simple string concatenation, since they use a fixed set of templates anyway.

The Heltec solar node still uses ArduinoJSON for god knows what in its included custom library.

variants/nrf52840/rak4631_eth_gw/platformio.ini

@@ -10,7 +10,6 @@ build_flags = ${nrf52840_base.build_flags}
   -DEINK_DISPLAY_MODEL=GxEPD2_213_BN
   -DEINK_WIDTH=250
   -DEINK_HEIGHT=122
-  -DNRF52_USE_JSON=1
   -DMESHTASTIC_EXCLUDE_WIFI=1
   -DMESHTASTIC_EXCLUDE_SCREEN=1
 ;   -DMESHTASTIC_EXCLUDE_PKI=1
@@ -34,8 +33,6 @@ lib_deps =
   rakwireless/RAKwireless NCP5623 RGB LED library@1.0.3
   # renovate: datasource=git-refs depName=RAK12034-BMX160 packageName=https://github.com/RAKWireless/RAK12034-BMX160 gitBranch=main
   https://github.com/RAKWireless/RAK12034-BMX160/archive/dcead07ffa267d3c906e9ca4a1330ab989e957e2.zip
-  # renovate: datasource=custom.pio depName=ArduinoJson packageName=bblanchon/library/ArduinoJson
-  bblanchon/ArduinoJson@6.21.6
 ; If not set we will default to uploading over serial (first it forces bootloader entry by talking 1200bps to cdcacm)
 ; Note: as of 6/2013 the serial/bootloader based programming takes approximately 30 seconds
 ;upload_protocol = jlink