Update theme

[jarrodmillman]

Several notable updates:

• https://github.com/scientific-python/scientific-python-hugo-theme/pull/208
• https://github.com/scientific-python/scientific-python-hugo-theme/pull/209
• https://github.com/scientific-python/scientific-python-hugo-theme/pull/200
• https://github.com/scientific-python/scientific-python-hugo-theme/pull/197
• https://github.com/scientific-python/scientific-python-hugo-theme/pull/196

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