Migrate to Kubernetes

[finnbear]

While expanding the infrastructure to other regions, using Kubernetes instead of AWS could improve data privacy and infrastructure portability.

To be clear, the current infrastructure is fine for the current use case (and the final decision to migrate has not been made). Kubernetes is just a potential solution to some design problems:

• Portability between cloud providers
• Self-hosting when required for privacy
• Scalability

It may cause new problems:

• Requires code changes to the server
• Having to host our own database servers (and uphold reliability standards)

Suggested by Cris#5429

[finnbear]

Migrated to Linode (+DynamoDB) for now.