Pupil-labs-realtime-api

- Require ``nptyping<2.0.0`` to avoid backwards incompatibility
- Update link to documentation in README

- Improve front-page documentation

- Fixed wrong variable name and added default value - 11

- Fix examples and documentation
- Finalize first draft of the :ref:`under_the_hood_guide` guide

- Fix documentation
- Revert: Remove :py:func:`pupil_labs.realtime_api.simple.discover_one_device`
- Revert: Add ``pupil_labs.realtime_api.simple.Network``

- Apply pre-commit fixes