Customize website address flag

I understand that the current easiest way to construct a website of a certain address is to manually rename the results of the `siteCreate` command of `zeronet.py`. Maybe a flag on the `siteCreate` command could let you choose what BIP-32 address to use?

Thanks,
Eli

Start with the siteCreate command in zeronet.py and trace how it currently generates and assigns the site's BIP-32 address. Define how a flag should select the address while preserving existing behavior, then verify site creation with both the default and customized address paths.

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