Homonim

Fixes:
- Remove repeated nodata warnings.
- Remove ``warnings.simplefilter()`` and ``warnings.catch_watchings()`` calls from API.
- Update deprectaed ``numpy.product()`` to ``numpy.prod()``.

Features:
- Round and clip to corrected image dtype range when it is an integer type.
- Write corrected image internal mask when nodata is None.
- Allow 12bit JPEG input / output images (when supported by Rasterio).
- Cache RasterArray mask.
- Issue warnings rather than log them.

Fixes:
- Allow --nodata before --dtype on CLI.

Docs:
- Expand CLI 'Output file format' section.
- Add 'Contributing' section.

- Work around for https://github.com/rasterio/rasterio/issues/2847.
- Documentation updates.

- Update documentation images.

- Add [read the docs](https://homonim.readthedocs.io) documentation.
- Case studies and tutorials.
- Automatic band matching for RGB and [`geedim`](https://github.com/dugalh/geedim) sourced images.
- Allow CLI and API *source* / *reference* band specifications.
- Allow non-standard image orientations.
- Minor bug fixes.

- Fix the example image on PyPI.