Add libpq to docker image, add script and readme

[sdankel]

• Installs libpq in the docker file. This was causing deployment to fail since it's a dependency of diesel.
• Replaces DATABASE_URL with a function that constructs the url since .env won't be copied to the deployed image anyway. This is handled in the deployment repo
• Adds more info about local development to the readme
• Adds the redirect URI so that github login will work locally and in production
• Adds a script for starting and restarting the server in docker. It uses docker network to communicate with the postgres container. The postgres container can still be run on it's own and works with the server when the server is started with cargo run instead of docker.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
forc-pub	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2024 10:30pm

[JoshuaBatty]

Thanks for writing up the build instructions.

[kayagokalp]

🚀