Misc code cleanup #266

Job	Run time
build-captive-portal	34s
get-targets / generate-matrix	3s
build-firmware (Wemos-D1-Mini-ESP32)	2m 8s
build-firmware (Wemos-Lolin-S2-Mini)	2m 15s
build-firmware (Wemos-Lolin-S3)	2m 37s
build-firmware (Pishock-2023)	2m 14s
build-firmware (Pishock-Lite-2021)	2m 5s
build-firmware (Seeed-Xiao-ESP32S3)	2m 6s
build-filesystem	1m 24s
merge-images (Wemos-D1-Mini-ESP32)	15s
merge-images (Wemos-Lolin-S2-Mini)	15s
merge-images (Wemos-Lolin-S3)	14s
merge-images (Pishock-2023)	13s
merge-images (Pishock-Lite-2021)	21s
merge-images (Seeed-Xiao-ESP32S3)	15s
done	1s
	17m 0s

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