Brats-toolkit

Better advertise the 2020 algorithms

What's Changed
* Update_Citations by ujjwalbaid0408 in https://github.com/neuronflow/BraTS-Toolkit/pull/27

New Contributors
* ujjwalbaid0408 made their first contribution in https://github.com/neuronflow/BraTS-Toolkit/pull/27

**Full Changelog**: https://github.com/neuronflow/BraTS-Toolkit/compare/v1.0.3...v1.0.4

* fix logo

* merged source and documentation code
* improved documentation
* changed visibility of non-user-facing methods

This is the classic version from the original manuscript.