deprecate: remove all packages related to gatsby plugin fastify

[moonmeister]

Description

Deleting gatsby-plugin-fastify as it'll no longer be maintained in favor of using the native gatsby serve command. Gatsby serve may not be perfect but with the netlfiy acquisition it did receive some love and I suspect is better than this plugin. If anyone wants to see this resurrected please see #440 and work towards creating a gatsby-adapter-node

Documentation

The archive-gatsby-plugin-fastify branch will live on as the last version of this code if it's ever needed.

Related Issues

#440

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Latest commit: 2f1d836

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[moonmeister]

LFG