Add new pyproject.toml post (#5)

* feat(pyproject): Start pyproject article

* feat(pyproject): Optional dependencies section

* feat(pyproject): Ruff section

* feat(pyproject): Add mypy section

* fix(pyproject): Linters intro

* feat(pyproject): Entrypoints section

* feat(pyproject): Metadata

* feat(pyproject): Dockerfile

* feat(pyproject): Github actions

* feat(templates): Add toc to posts

* fix(pyproject): Update numpy version, fix some errors

* feat(pyproject): Finish first draft

* fix(pyproject): Update date