useful for small -C3 boards with 2MB flash memory only. Based on suggestions from https://github.com/Aircoookie/WLED/pull/2951 .
Needs `-D WLED_DISABLE_OTA` as OTA is not possible with 2MB.
RAM: [== ] 22.5% (used 73724 bytes from 327680 bytes)
Flash: [========= ] 94.9% (used 1492020 bytes from 1572864 bytes)
