feat: Keyboard bindings

[jhildenbiddle]

Summary

• Add new keyBindings configuration option
• Add default docsify bindings
  • \ Toggle sidebar menu. Includes hover/focus hints via title/aria-keyshortcuts attributes.
  • / Focus on search field (also supports Cmd / Ctrl + k). Includes visual and hover/focus hints via title/aria-keyshortcuts attributes. This is a standard shortcut as seen on competitors like Docusaurus, GitBook, Starlight, and VitePress.
• Add keyBindings documentation (see preview link below)
• Add e2e tests

Related issue, if any:

2278

What kind of change does this PR introduce?

Feature

For any code change

• [x] Related documentation has been updated, if needed
• [x] Related tests have been added or updated, if needed

Does this PR introduce a breaking change?

No

Tested in the following browsers:

• [x] Chrome
• [x] Firefox
• [x] Safari
• [x] Edge

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Name	Status	Preview	Comments	Updated (UTC)
docsify-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 30, 2023 6:39pm

[jhildenbiddle]

@sy-records? @trusktr?