Set up deployments of `packages/server` with Docker and Kamal

[wclausen]

Adds kamal initialization folders/files for our deployments to Hetzner servers.

Adds hopefully useful/reasonably concise document outlining the deployment architecture and kamal basics so this can be referenced in the future/you can pipe it to chatty geeps and get back an answer real quick.

[wclausen]

@Melvillian yep, we do actually need this inside packages/server. Fixed that. And added a README.md as requested.

Ended up force pushing these changes after rebasing on latest main. Here's what I did:

• Moved all the kamal things into packages/server
• Updated the packages/server/config/deploy.yml (henceforth referred to as deploy.yml) to have proper values/config
• Added a Dockerfile for packaging the server code into a container (inspired by the bun documentation)
• Updated routes.ts to include a route that kamal will use for health checks when deploying.
• Ran kamal setup to install docker on our two servers and install/run postgres and redis as accessories.
• Debugged and eventually deployed our koa server via kamal redeploy
• Verified our DB is live by connecting to it via VSCode's Postgresql Explorer extension

[wclausen]

Visual proof that we have a live server:

[Melvillian]

I'm going to approve and merge because the problem with this PR are purely at the infra auth level, and I want the latest changes made in this PR to go to main so I can use them.