Add documentation on how to use a custom domain

[dhcdata]

No description provided.

[hansl]

That is not our documentation format at all. If you're interested in doing the right change, you should add the argument documentation to the /docs/wiki folder in the project, which contains all our documentation.

[dhcdata]

I would gladly put it where ever it belongs in the correct format if you could point to any documentation on formatting.

There is no /docs/wiki folder in the project. There is a /docs/documentation and a /docs/design.

I didn't think to put it in either of those places since github-pages:deploy command isn't documented there at all. This command is also not documented to the wiki attached to the project. This command is however documented on the /README.md page.

[hansl]

/docs/documentation is what I meant. github-pages:deploy should be documented in there since we officially support it.

[austingreendev]

@dhcdata my pull-request #3392 introduces a --custom-domain flag which handles the base-href manipulation and CNAME file creation. Your additions look good, but I would suggest using that new flag. Thanks!

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