Update dependency sphinx_rtd_theme to v1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sphinx_rtd_theme	==0.5.2 -> ==1.0.0

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Release Notes

readthedocs/sphinx_rtd_theme

### [`v1.0.0`](https://togithub.com/readthedocs/sphinx_rtd_theme/compare/0.5.2...1.0.0) [Compare Source](https://togithub.com/readthedocs/sphinx_rtd_theme/compare/0.5.2...1.0.0)

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