Allow custom webpage addresses #80

Job	Run time
Info	4s
x86_64-windows-gnu(win7)	2m 23s
x86_64-macos-none	3m 14s
x86-windows-gnu(win7)	2m 14s
aarch64-macos-none	1m 23s
x86_64-windows-gnu	4m 10s
x86-windows-gnu	3m 40s
aarch64-windows-gnu	3m 36s
x86_64-linux-musl	2m 52s
aarch64-linux-musl	2m 48s
arm-linux-musleabi(cortex_a7)	2m 44s
arm-linux-musleabi(mpcorenovfp)	2m 40s
arm-linux-musleabi(pi_zero_w)	3m 1s
mipsel-linux-musl	2m 41s
	37m 30s

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