Sphinx-hoverxref

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* Handle explicit intersphinx inventory names in all domains --not just ``std`` (https://github.com/readthedocs/sphinx-hoverxref/pull/236)

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* New config ``hoverxref_tooltip_lazy`` to improve large page experience (https://github.com/readthedocs/sphinx-hoverxref/pull/227/)

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* Ignore ``pending_xref`` (missing references) that don't have domains (https://github.com/readthedocs/sphinx-hoverxref/pull/210)

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* Prefix all the CSS classes with ``hxr-`` to avoid collisions with other frameworks

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* Fix an issue with intersphinx and domains when the ``reftype`` was unknown

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* Improve intersphinx robustness
* Update all dependencies for building documentation
* Packaging: use bumpver and flit to build/publish
* Improve documentation installing instructions
* Setup pip-tools together with dependabot to handle dependencies updates
* Remove tests for Python 3.6 and Python 3.7 and add newer Sphinx versions (4.4, 4.5 and 5.0)