update docs, embed metadata to family.c and board.h #570

Job	Run time
set-matrix	2s
hil-hfp	1m 49s
build (arm-gcc) / family (-b feather_nrf52840_express)	49s
build (arm-gcc) / family (-b max32666fthr)	1m 19s
build (esp-idf) / family (-b espressif_p4_function_ev)	8m 18s
build (arm-gcc) / family (-b metro_m4_express)	56s
build (esp-idf) / family (-b espressif_p4_function_ev -f1 CFG_TUD_DWC2_DMA_ENABLE -f1 CFG_TUH_DWC2_DMA_ENABLE)	8m 33s
build (esp-idf) / family (-b espressif_s3_devkitm)	9m 5s
build (arm-gcc) / family (-b lpcxpresso11u37)	42s
build (esp-idf) / family (-b espressif_s3_devkitm -f1 CFG_TUD_DWC2_DMA_ENABLE)	8m 22s
build (arm-gcc) / family (-b ra4m1_ek)	52s
build (arm-gcc) / family (-b raspberry_pi_pico)	2m 3s
build (arm-gcc) / family (-b raspberry_pi_pico2)	2m 22s
build (arm-gcc) / family (-b stm32f072disco)	43s
build (arm-gcc) / family (-b stm32f723disco)	59s
build (arm-gcc) / family (-b stm32f723disco -f1 CFG_TUH_DWC2_DMA_ENABLE)	57s
build (arm-gcc) / family (-b stm32h743nucleo)	58s
build (arm-gcc) / family (-b stm32h743nucleo -f1 CFG_TUD_DWC2_DMA_ENABLE)	1m 0s
build (arm-gcc) / family (-b stm32g0b1nucleo)	41s
hil-tinyusb	1s
	50m 31s

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