add BIQU_BX_TFT70 images

MarlinFirmware / MarlinDocumentation

Marlin Firmware Documentation Project

https://marlinfw.org

GNU General Public License v3.0

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Open ellensp opened 4 months ago

ellensp commented 4 months ago

Added images for the BIQU_BX_TFT70, to try and stop users enabling this option for the BTT TFT70