Bump furo from 2020.12.30b24 to 2021.2.28b28 in /docs

[dependabot]

Bumps furo from 2020.12.30b24 to 2021.2.28b28.

Changelog

Sourced from furo's changelog.

Changelog

2021.02.28.beta28

• Fix a bug in how stylesheets are handled.
• Clarify how to install directly from GitHub.
• Document how to install from git.

2021.02.28.beta27

• Center figures and legends with margin: auto.
• Improve compatibility with json builder, by not passing functions into the Jinja templates.
• Add a friendly comment to domainindex.html, about it not being implemented.
• Add styling for GUI labels.

2021.02.27.beta26

• Fix wrong height on wide screens, for pages with a tall sidebar but not-tall content.
• Add type annotations to the codebase! 🎉
• Fix an instance of missing brackets in documentation.

2021.02.21.beta25

• Document how to inject custom code in Sphinx documentation
• Document that pygments_dark_style is Furo-specific
• Make sphinx-panels respond to dark mode with Furo
• Stop defering Javascript, which was causing search to break in some cases.

2020.12.30.beta24

• Disable environment caching if pygments_dark_style is changed.
• Revert to earlier background color for inline literals, and allow configuring it via a CSS variables.

2020.12.28.beta23

• Fix code-block overflow issue, introduced by the fix for sphinx-copybutton compatibility.
• Tweak horizontal rules, to always be 1px tall.
• Tweak background color for inline literals, to match code blocks.

2020.12.28.beta22

• MAJOR: Move theme files into a "furo" folder.
  • This affects any users deriving from furo's templates.
• Add (custom) support for pygments_dark_style.
• Add support for genindex pages.
  • Note that html_split_index is not supported at this time.
• Add support for highlighting API elements, when accessed via "#hash" in URL.

... (truncated)

Commits

• 7521159 Prepare release: 2021.02.28.beta28
• 94b2661 Update changelog
• 62aa24e Pacify black
• 7c951f8 Clarify how to install directly from GitHub
• 642bd53 Tweak how styles are handled
• 25c5b30 Revert "Start using the npm-installed gulp"
• 5350c4a 🎨
• a891837 Document how to install from git
• c919b2a Start using the npm-installed gulp
• 71d079a Update sass version
• Additional commits viewable in compare view

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[cjolowicz]

@dependabot rebase