Update sphinx-rtd-theme requirement from ~=0.5.2 to ~=1.0.0 (#83)

Updates the requirements on [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) to permit the latest version.
- [Release notes](https://github.com/readthedocs/sphinx_rtd_theme/releases)
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@0.5.2...1.0.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -14,4 +14,4 @@ ipython ~=7.28.0
 numpydoc ~=1.1.0
 sphinx ~=4.1.2
 sphinx-copybutton ~=0.4.0
-sphinx_rtd_theme ~=0.5.2
+sphinx_rtd_theme ~=1.0.0