docs: deployment information

Author: budak7273

DEPLOYMEND.md

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+# Deployment
+
+For more info, see the [frontend's deployment documentation](https://github.com/satisfactorymodding/smr-frontend/blob/staging/DEPLOYMENT.md).
+
+## Staging
+
+The `staging` branch automatically deploys to ficsit.dev via fluxcdbot on Vilsol's internal `ficsit-app` private repository.
+It can take upwards of 20 minutes to deploy once something is merged.
+
+## Production
+
+The production smr-api is hosted on Vilsol and Night's server stack.
+Deployments are manual.
+
+To find out what version is currently live, ask Vilsol to check it.