Document preview_context on overview page
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type: feature
- Dominant language
- JavaScript
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Description
**Is your feature request related to a problem? Please describe.**
The config variable `preview_context` is [mentioned](https://github.com/netlify/netlify-cms/blob/89848e034451baed52fb8911d3778a2f469462f8/website/content/docs/github-backend.md#L27) on the GitHub backend, but it (at least) also works for GitLab.
**Describe the solution you'd like**
Maybe document the config variable on the overview page so it won't get overlooked?
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