Refs #942, #1404, #1405, #1416, #1420, #1421, #1422, #1423, #1425, #1431, #1443, #1446, #1449, #1467, #1469, #1470, #1488

Refs #1467, refs https://github.com/simonw/datasette-auth-tokens/issues/4

Rework the `--static` documentation to better differentiate between the filesystem and serving locations. Closes #1457
Co-authored-by: Simon Willison <swillison@gmail.com>

Updates the requirements on [pyyaml](https://github.com/yaml/pyyaml) to permit the latest version.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](https://github.com/yaml/pyyaml/compare/5.3...6.0

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* Upgrade to httpx 0.20, closes #1488
* TestClient.post() should not default to following redirects

Updates the requirements on [beautifulsoup4](http://www.crummy.com/software/BeautifulSoup/bs4/

) to permit the latest version.

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Bumps [black](https://github.com/psf/black) from 21.7b0 to 21.9b0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits

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Updates the requirements on [pluggy](https://github.com/pytest-dev/pluggy) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pluggy/releases)
- [Changelog](https://github.com/pytest-dev/pluggy/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pluggy/compare/0.13.0...1.0.0

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Change "above" to "below" to correct correspondence of reference to example.

Updates the requirements on [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest-xdist/releases)
- [Changelog](https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-xdist/compare/v2.2.1...v2.4.0

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Updates the requirements on [pytest-timeout](https://github.com/pytest-dev/pytest-timeout) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest-timeout/releases)
- [Commits](https://github.com/pytest-dev/pytest-timeout/commits

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Closes #1486

This reverts commit 98dcabcc.

Refs #942, #1421, #1423, #1431, #1443, #1446, #1449

Bumps [black](https://github.com/psf/black) from 21.6b0 to 21.7b0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits

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Updates the requirements on [trustme](https://github.com/python-trio/trustme) to permit the latest version.
- [Release notes](https://github.com/python-trio/trustme/releases)
- [Commits](https://github.com/python-trio/trustme/compare/v0.7.0...v0.9.0

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The text refers to the parameter as `searchmode` but the `metadata.json` example uses `search_mode`. The latter doesn't actually seem to work.

Refs ##1442

* Ability to deploy additional branch demos, closes #1442
* Only run tests before deploy on main branch
* Documentation for continuous deployment