Provide Sample Sanity Data

[codercatdev]

Add an export for the original data set, even if this includes the site data and a single mission Once someone sets up their own sanity environment it becomes a bit of a blank slate

Provide a sample export

https://www.sanity.io/docs/export

Store the JSON in the repo

Add instructions on how to import

Now that the dataset is in the repo provide some minimal commands for importing the base into production dataset.

https://www.sanity.io/docs/importing-data