build!: define in pyproject.toml

[jsstevenson]

close #275

• use src/ layout <-- could make deployment finicky, we should double check (I think it's fine from looking at how the procfile calls it, but we'll need to watch deployment next time)
• define build configs in pyproject.toml using setuptools-scm rather than version.py
• update some associated metadata

[jsstevenson]

Need to update .pre-commit-config in a separate PR. Setup-based checks should start passing once we put out a proper release (can do so after this PR) and fix linting/formatting (separate PR).

[korikuzma]

use src/ layout <-- could make deployment finicky, we should double check (I think it's fine from looking at how the procfile calls it, but we'll need to watch deployment next time)

@jsstevenson I think you need to change Procfile to cd server/src. I had to do this for MetaKB and Variation Normalizer.

[jsstevenson]

@jsstevenson I think you need to change Procfile to cd server/src. I had to do this for MetaKB and Variation Normalizer.

@korikuzma good intel! I guess I can see why that might happen