Relaxit

1. Updated classes docstrings
2. Added tests docstrings and comments
3. Fixed coverage badge committing

Rename repository into `relaxit`

**This release introduces many changes**:
1. Rename `StraightThroughBernoulli` into `StochasticTimesSmooth`
2. Implement truly `StraightThroughBernoulli`
3. Conduct demo experiment with new `StraightThroughBernoulli` and update it for `StochasticTimesSmooth`
4. Change tricky notation in some distributions into `logits` and `probs`
5. Refactor old and add new tests
6. Refactor documentation and add custom `relaxit.css` style
7. Update `README.md` in demo and root directories to match new distribution names

**Full Changelog**: https://github.com/intsystems/discrete-variables-relaxation/compare/v1.0.1...v1.1.0

We release "Just Relax It"!
- [8 algorithms implemented](https://github.com/intsystems/discrete-variables-relaxation/tree/main/src/relaxit/distributions)
- [Demo experiments](https://github.com/intsystems/discrete-variables-relaxation/tree/main/demo)
- [Blog Post](https://github.com/intsystems/discrete-variables-relaxation/blob/main/assets/blog-post.pdf)
- [Documentation](https://intsystems.github.io/discrete-variables-relaxation/)
- [Tests](https://github.com/intsystems/discrete-variables-relaxation/tree/main/tests/distributions)