Pyproject2conda

Added

- Now use `logging` to print info output.

Changed

- cli now uses `typer`. Since the program was already typed, this simplifies the
interface.
- Program can now be called with any of `pyproject2conda`, `p2c`, or
`python -m pyproject2conda`.
- Added cli options to web documentation.
- Fixed small typos and typing issues.
- The cli option `--python-include` now requires an argument. This is due to
`typer` not liking options with zero or one arguments. Instead of the bare
flag `--python-include` including the python spec from `pyproject.toml`, you
have to pass `--python-include infer` to get that behavior.
- Added extra `all` to pip install options. The default is to not include `rich`
or `shellingham`. Using `pip install pyproject2conda[all]` includes these
optional packages. Note that the conda-forge recipe is based on the plain
install (i.e., no `rich` or `shellingham`). However, the conda-froge recipe
for `typer` does include these. That means, if you want to install
`pyproject2conda` without the optional extras, you'll have to use pip.

Changed

- Fixed edge case where `--overwrite=check` and have a `user_config`. Now when
using `p2c project` with a `user_config` and `overwrite=check`, the timestamp
of the output file will be compared to both the `filename=pyproject.toml` and
`user_config`.

Added

- Added `project` subcommand. This uses a configuration in `pyproject.toml` to
build multiple enivonments in one go.
- Added `--deps` and `--reqs` flags to include extra conda and pip requirements.
- Added `--overwrite` to check if output file exists.
- Now (correctly) using rich_click.
- Added tests for all new cases, and some edge cases.

Added

- Added `--sort/--no-sort` flag to cli. Default is to sort dependencies. This
fixes issues with changing order in `pyproject.toml` leading to different yaml
files.

Changed

- Changed structure of the repo to better support some third party tools.
- Moved nox environments from `.nox` to `.nox/{project-name}/envs`. This fixes
issues with ipykernel giving odd names for locally installed environments.
- Moved repo specific dot files to the `config` directory (e.g.,
`.noxconfig.toml` to `config/userconfig.toml`). This cleans up the top level
of the repo.
- added some support for using `nbqa` to run mypy/pyright on notebooks.
- Added ability to bootstrap development environment using pipx. This should
simplify initial setup. See Contributing for more info.

- Main repo now on usnistgov.