[from-gatsby] another older community resource added

[sarah11918]

This adds another "Migrate from Gatsby" blog post, and additionally reorders posts for better matching pairs in the grid.

(I searched through all featured blog posts in our past What's New monthly showcase posts for any Gatsby resources we might have missed, and found this one.)

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[ArmandPhilippot]

LGTM, much better with the reduced blank space!