feat: Centralize configuration in one place.

[cullylarson]

Changes

• Move all (most) process.env references into config.ts.
• Add zod checks for config.
• Remove ts-node-dev. Doesn't seem to be needed, creates some weird situations where processes don't exist (e.g. buildProd).
• Refine the buildProd script.
• fix: Prettier config in bisonapp is different from prettier config in packages/create-bison-app/template. So if you save a file while editing bisonapp and then create a bison app from it, it may have lint errors. Resolved this by copying the prettier config from packages/create-bison-app/template into the root folder.

Checklist

• [ ] Requires dependency update?
• [x] Generating a new app works

[cullylarson]

It looks like this removes the APP_ENV and BASE_URL variables, we should also remove them from all the env files in the template.

@kgajera I removed them in https://github.com/echobind/bisonapp/pull/313. Was going to resolve that once it's merged.

[cullylarson]

CI is failing because of some issues with how PORT is set in the .env files. Will resolve in #313.