You use a third party CMS. There are lots of free ones, like netlify-cms or even WordPress. Also you can use Sanity.io or Contentful there's great integration with those
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If it's a simple site like a restaurant within gatsby, they won't be making design modifications.
If they want blog/edit pages, Gatsby's CMS has that feature without having to dig into the code.
Gatsby has a CMS? Or you have to make it get data from a third party CMS?
You use a third party CMS. There are lots of free ones, like netlify-cms or even WordPress. Also you can use Sanity.io or Contentful there's great integration with those