Popmon

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Features:

* Traffic light overview (62)

Documentation:

* Downloads badge readme
* List talks and articles in readme (66)
* Add image to ``README.rst`` (64)

Other improvements:

* Change notebook testing to pytest-notebook (previously these tests were skipped in CI). Add try-except ImportError for pyspark code. (67)
* Fix a few typo's
* Suppress ``matplotlib backend`` verbose warning
* Click on "popmon report" also scrolls to top
* Update HTML reports using ``Github Actions`` (63)
* Bugfix in ``hist.py`` that broke the advanced tutorial.

Notebooks:

* Add ``%%capture`` to pip install inside of notebooks.
* Make package install in notebooks work with paths with spaces.
* ``Pickle`` doesn't work with tests (not really a popmon-specific feature anyway). Changed the notebook to fix the issue, left the code for reference.

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* Traffic light overview
* Add image to ``README.rst``
* Add building of examples to Github Actions CI
* Format notebooks (``nbqa``)
* Remove ``matplotlib backend`` warning
* Fix navigation in title of report

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* Fix: refactorize Bin creation and fix scipy version for pytestDevelop
* Fix: dataset links in tutorial
* Lint: isort 5, latest black version
* Internal: simplification of weighted mean/std computation

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* Fixing automated ``PyPi`` deployment.
* Removing enabling of unnecessary notebook extensions.

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* Using ``ING``'s matplotlib style for the report plots (orange plots).
* Add ``popmon`` installation command at the beginning of example notebooks (seamless running).

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* Extending make.bat and Makefile to support ``make install`` (on all platforms).
* Add a snippet on how to use ``popmon`` with Spark dataframes to the docs.
* Update tutorial badges in the documentation.
* Migrate to standard MIT license header.