Py-html-checker

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**A major new release to modernize package**

* Removed support for Python<3.8;
* Added support for Python from 3.8 to 3.10;
* Added support for Click>=8.0;
* Upgraded requirements:

* 'Jinja' to ``>=3.0``;
* 'CherryPy' to ``>=18.0.0``;
* Removed 'colorama' requirement since it is just a 'colorlog' extra requirement
for Windows system;
* Removed 'MarkupSafe' requirement that is no longer needed since upgrade to
'Jinja' 3.x;

* Removed useless requirement to ``six``;
* Splitted utils in various modules;
* Modernized package configuration;
* Modernized makefile;
* Updated README;
* Added documentation (there is still a lot of work)
* Added a logo;
* Added Github issue templates;
* Upgraded ``setup.cfg`` and project's ``__init__`` module to drop usage of
``pkg_resources`` in profit of importlib
`26 <https://github.com/sveetch/py-html-checker/issues/26>`_;
* Implemented ``--serve`` option on ``page`` command to serve contents once the report
has been built;

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Fix issue with currently used Jinja version (2.x) which did not pinned MarkupSafe
version but use a ``soft_unicode`` function which have been dropped since
MarkupSafe 2.1.0. This leaded to HTML export to be unavailable even with Jinja

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* Include a fix proposed by acbaraka to enhance Window support, even it's not an
official support;
* Clean validator output from a line information about environment variable
``_JAVA_OPTIONS``, close 22;
* Add Tox to dev requirements;
* Remove Python 3.5 support;
* Validate support for Python 3.6 to 3.8;

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* Add this changelog;
* Upgrade to ``vnu==20.6.30``;
* Rename commandline name from ``html-checker`` to ``htmlcheck`` following this
document `<https://smallstep.com/blog/the-poetics-of-cli-command-names/>`_;
* Add ``twine`` in extra requirements ``dev`` and use it in for Makefile
``release`` action;

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First usable version with HTML and JSON exporters and every required vnu option
support.