Piny

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* Fix ``Help`` section in ``README.rst`` (31) by pilosus
* Fix Sphinx release variable (30) by pilosus

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* Fix Sphinx config, fix README.rst image markup (28) by pilosus

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* Sphinx documentation added (12) by pilosus
* Piny artwork added (6) by Daria Runenkova and pilosus

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* Rename parent exception ``PinyError`` to ``ConfigError`` (18) by pilosus
* Add feature request template for GitHub Issues (20) by pilosus

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* Issue and PR templates added, minor docs fixes (16) by pilosus

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* Data validators support added for ``Pydantic``, ``Marshmallow`` (2) by pilosus
* ``CONTRIBUTING.rst`` added (4) by pilosus