Remove auto-deploys to Poseidon internal infra

* We now use GitHub Actions instead of a private Drone which is great
for OSS build transparency, but one drawback to that change is that
we no longer auto-deploy matchbox to internal Poseidon Labs infra
* We don't want public workflows for deploys to our private infra

.github/deploybot.yaml

@@ -1,6 +0,0 @@
-# Config for deploybot.app
-# Docs https://docs.deploybot.app/config/
-# Ordered list of Github Deployment environments
-deployments:
-- name: production
-  on_push: true