Add self-hosting page

[josh-padnick]

Add a page mentioning repo-copier as a way to self-host the library

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[oredavids]

Content looks good. Left one minor suggestion.

The tests don't pass currently due to the docs/guides/stay-up-to-date/index.md changes. Please revert that. We unfortunately haven't worked on preventing that from happening when working locally.

[oredavids]

Did not catch this earlier but the self-hosting markdown file needs to be moved into the _docs-sources directory and then run the yarn regenerate:local command so it is copied over to docs with its metadata.

[josh-padnick]

@oredavids I'm sorry, but I'm afraid I'm confused here. I keep trying variations of moving the file and running yarn regenerate:local. But It doesn't work. Would you mind taking a pass at what I need to do to get this fixed?

[oredavids]

@josh-padnick It appears that your last commit fixed the issues so i did not have to do anything.

[josh-padnick]

Ah nice, thank you! Thought I'd already tried that, but guess not. Merging now!