Demonstrate deployment on Burr UI on GCP

**Is your feature request related to a problem? Please describe.**

We have the [s3 server](https://github.com/DAGWorks-Inc/burr/blob/main/burr/tracking/server/s3/README.md) as well as a fairly complex set of terraform files, but we don't have a simple deploy on GCP tutorial.

**Describe the solution you'd like**

A documentation page/example for how to deploy on GCP. We will link from the docs.
Terraform would be nice too!

Ideally:

- Inside a VPN
- Uses S3 with the [google-compatible API](https://cloud.google.com/storage/docs/interoperability)
- Simple, single-tenant server (no need for horizontal scaling as we are not write-bound)