Flask-reuploads

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- fix deprecation warning for pytest

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- improve documentation
(`133 <https://github.com/jugmac00/flask-reuploaded/issues/133>`_)
- drop support for Python 3.6
- add support for Python 3.11
- update dependencies for building documentation

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- add contexts to coverage report
- pin documentation dependencies to prevent future breakage
- fix typing errors (mypy) with recently released Flask 2.0.1
- add support for Python 3.10

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- make type checkers aware that this library is using type annotations

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- raise test coverage to 100%
- use official `Pallets` theme for the documentation
- remove deprecated `patch_request_class` helper function; use `MAX_CONTENT_LENGTH` instead.
- `autoserve` now has been deactivated by default and needs explicit activation
via the setting `UPLOADS_AUTOSERVE=True`

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- improve documentation of example app
- document surprising `autoserve` feature
- issue a warning when using `autoserve` without explicit configuration