Changes

Implements handling for environment variables using pydantic.BaseSettings (see: #41)
Reworks the display of validation and error messages (see: #41)
Refactors the utils module (see: #41)
Overhauls development tooling (flake8 -> ruff, upgrades, etc.) (see: #41)
Updates documentation (see: #41)
Updates README.md to use raw Github logo link, rather than local path. (see: #40)
Reworks Github workflows to use actions/setup-python inbuilt caching (see: #43)

Closes