Zntrack

Rename package in accordance to 90

What's Changed
* Rename `py-track` to `ZnTrack` by PythonFZ in https://github.com/zincware/ZnTrack/pull/90
* Create index.html by PythonFZ in https://github.com/zincware/ZnTrack/pull/91


**Full Changelog**: https://github.com/zincware/ZnTrack/compare/v0.1.2...v0.1.2b

See 59 for all changes and fixed bugs.

This release brings a completely new interface to PyTrack and is not backwards compatible.
The new API will be maintained and if possible all future releases will be backwards-compatible.