docs(starters): gatsby starter reasonml

[iwilsonq]

Description

Start building static sites with Gatsby and type-safe ReasonML.

[sidharthachatterjee]

LGTM, thank you @iwilsonq 👍

[sidharthachatterjee]

ci/circleci: starters_validate is failing due to an unrelated issue. Will fix that in a separate PR. Merging this in for now.

[gatsbot]

Holy buckets, @iwilsonq — we just merged your PR to Gatsby! 💪💜

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