Updating setup stuff

[ngerow2025]

What

This is just updating the readme and also adds a convience functions for checking that requred env vars are given when running the server binary.

Why

Setup was already a pain because the documentation was old and inaccurate, even with proper creds.

Test Plan

I just ran it before and after the changes and no differences were observed. I also tested when environmental variables were missing. Before if HOST/PORT/REDIS_URL was not specified there were no clear error messages but the call was failed, some things were automatically filled when missing.

Env Vars

no actual changes, just clearing things up.

Documentation

I updated a lot of the README things for running. I basically just documented what I had to do in order to get it running from mostly scratch.

Checklist

• Tested all changes locally

[datadog-computersciencehouse]

⚠️ Warnings

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Assertion failed: {name} environmental variable cannot be empty/missing at /home/runner/work/rideboard/rideboard/src/server.rs:43

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[tallen42]

This change seems unrelated to the rest of the PR.

Also what does it do?

[ngerow2025]

There was some weirdness that I think is my fault, I explained in slack