Rastro

Fixed
- Fix bad tagging in release

Fixed
- Fixed regression in path of `README.md` file in base rastro `Cargo.toml`

Added
- `anomaly_true_to_mean` and `anomaly_mean_to_true` anomaly conversion functions to enable
direct conversion between true and mean anomaly values.
- Added documentation example build and test pipeline to ensure all code examples in
documentation execute without error
- Added figure support to documentation. It is not possible to automatically generate and
include matplotlib and plotly figures as part of the documentation as part of the release process.

Changed
- Overhauled documentation approach. Migrated to [material-mkdocs](https://squidfunk.github.io/mkdocs-material/)
for improved style and feature support.
- Moved from [*] style to (*) style units references in documentation to mitigate cargo doc warnings

Fixed
- Made change to main `cargo.toml` file in attempt to get rust documentation publishing on docs.rs
- Fixed regression in release workflow

Changed
- Update release process to handle versioning and local development better.
The `rastro_python` package is now kept in a state with a placeholder version
of `0.0.0` and a relative path so that it can be developed against locally
and it will work in the CI pipeline without having the rust package released.
To release you now update the version in `rastro/Cargo.toml` and make a
tagged release on Github to trigger the release pipeline.

Added
- Added README to PyPi.org release
- Added badges to README

Fixed
- Attempt to fix issue with pip distribution of rust crate