Remove board finder, add support for AXP2101 and T-Beam-S3-Core #775

Job	Run time
Run cppcheck in Docker	9s
Run cppcheck	2m 5s
Formatting Check	32s
Compile Firmware (heltec-v1)	1m 18s
Compile Firmware (tlora-v1)	1m 15s
Compile Firmware (tbeam)	1m 18s
Compile Firmware (t_internet_poe)	1m 18s
Compile Firmware (heltec-v3)	1m 26s
Compile Firmware (tlora-v2)	1m 11s
Compile Firmware (heltec-v2_0)	1m 22s
Compile Firmware (tbeam-s3-core)	1m 35s
Compile Firmware (tbeam_axp2101)	1m 13s
	14m 42s

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