Update sphinx-rtd-theme requirement from <1 to <2

[dependabot[bot]]

Updates the requirements on sphinx-rtd-theme to permit the latest version.

Changelog

Sourced from sphinx-rtd-theme's changelog.

1.0.0

Incompatible Changes

• The minimum supported python version is now 2.7 or 3.4 and greater (#1093)
• The minimum supported Sphinx version is now 1.6 (#1091)

Deprecated

• Support for Sphinx's HTML4 writer is deprecated and will be removed in version 2.0 (#1091)

Features

• Add support for Sphinx 4.x (#1123)
• Add support for Docutils 0.17 (#1185 and #1199)
• Fixed logo scaling on IE11 (#1183)
• Added support for logos as URLs (#1171)
• Align top and side navigation background colors on mobile (#1132)
• Added support for deep toc levels (#1089)
• Updated translations for Chinese, Dutch, Estonian, French, German, Italian, Lithuanian, Persian, Polish, Portuguese, Russian, Spanish, Swedish, and Turkish locales

A number of accessibility features were added in this release:

• Allow keyboard to toggle menu expansion (#1167)
• Allow keyboard to activate permalink (#1162)
• Show keyboard focus on buttons (#1161)
• Maintain aria-expanded along with .current in menu (#1151)
• Respect tab order for prev/next buttons (#1051)

Fixes

• Updated Google analytics integration (#1129)
• Add classifier separation on Sphinx 2+ HTML4 writer (#1192)
• Added missing space char in footer (#1188)
• Fix navigation right padding on level2+ elements (#1068)
• Fix navigation expansion button sizes (#1067)
• Wrap inline literals (#1050)
• Fix aria labels (#1056)
• Don't toggle navigation terminal nodes (#1049)
• Fix <pre> overflow (#1220)
• Fix literal/ref style inside <dl> (#1088)

Other Changes

... (truncated)

Commits

• c9b1bde Replace sphinx reST with native reST
• 15e4a90 Update translations for 1.0 release
• 2254b1f Update docs and versions for 1.0.0 release
• acada32 Merge pull request #1220 from readthedocs/nienn/fix-sphinx-4-pre-overflow
• e319184 Merge branch 'master' into nienn/fix-sphinx-4-pre-overflow
• 20f205f Merge pull request #1217 from readthedocs/agj/release-labels
• 2774670 Add CSS max-width to dl.property
• b557851 Make section labels verbose to avoid numeric labels
• 73d1707 Merge pull request #1088 from readthedocs/Blendify/fix-717
• 3a03112 Fix build
• Additional commits viewable in compare view

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[Cielquan]

@dependabot ignore this major version

[dependabot[bot]]

OK, I won't notify you about version 1.x.x again, unless you re-open this PR or update to a 1.x.x release yourself.