Deeplabcut2yolo

**Others**
- Migrated documentation to GitHub Pages
- Use pip-tools for compiling dev dependencies

**Bug Fix**
- Bounding box calculation ignores the non-visible keypoints

**Others**
- Reduced package size

**Bug Fix**
- Override class names should work with str and list[int]

**Bug Fix**
- Default class names are correctly defined

**Functionality**
- convert() no longer takes test_paths as they are not used in YOLO data.yml.
- convert() no longer takes list of dataset paths as there is not much use case.
- convert() now extract class names from dataset config as the default.
- Added a few argument checkers for convert().

**Performance**
- Minor improvement by reimplementing some argument checking.

**Others**
- Removed unused internal functions
- Added docstring for get_flip_idx()
- Reduced package size