Detaching stackbit-pull

- added sanity logic

Author: rodikh

README.md

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+Stackbit-pull
+---
+Pulls content from various headless CMSs and saves it in a format that's ready to be used by various Static site generators. Only works for CMS content that was generated by [Stackbit](https://www.stackbit.com). 
+This project is being replaced by [Sourcebit](https://github.com/stackbit/sourcebit).
+
+### Supported sources
+- Contentful
+- Sanity
+- Datocms
+- Dev.to
+
+### Supported SSGs
+- Gatsby
+- Hugo
+- Jekyll
+
+> for Next.js, use [Sourcebit](https://github.com/stackbit/sourcebit-target-next)