New docs for subdomain configuration

[hahnbeelee]

Things to note about this:
UX-wise - everything will need to be nested within the repo. This might be a less favorable UX, but this allows our users to have any sort of custom directory and can be deeply nested like /custom/directory.

To-Do

• Update Cloudflare docs
• Update AWS docs

the main blocker here is that I need to figure out how to do it on these platforms.

[ethanpalm]

Suggested change

	Edit your file structure so that all your files are within a folder which is your custom subpath. So if you want to host your docs at `/docs` you would do the following:
	Create a folder with the same name as your custom subpath and add all your documentation files to the folder. If you want to host your docs at `/docs`, you would do the following:

I want to make it clear to people what files they need to add to the directory since it looks like docs.json should remain outside the subpath directory. Please let me know if this isn't accurate though. Goal is that people quickly know what to organize into their subpath folder.

[ethanpalm]

Suggested change

	In your main website add the following rewrites to your `vercel.json`.
	In your main website add the following rewrites to your `vercel.json` file.

This is tiny, but the sentence feels incomplete as is.