board/httpd: enable usage texts and default shell #40

Job	Run time
supervisor (curios-httpd) / build (amd64)	1m 55s
supervisor (curios-nftables) / build (amd64)	1m 53s
supervisor (curios-ntpd) / build (amd64)	3m 35s
supervisor (curios) / build (amd64)	5m 23s
supervisor (curios-httpd) / build (arm64)	2m 8s
supervisor (curios-ntpd) / build (arm64)	3m 48s
supervisor (curios-nftables) / build (arm64)	1m 47s
supervisor (curios) / build (arm64)	5m 33s
supervisor (curios-nftables) / push	16s
supervisor (curios-httpd) / push	18s
supervisor (curios-ntpd) / push	26s
supervisor (curios) / push	29s
	27m 31s

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