Always show lang menu in navbar

[chalin]

• Fixes Language dropdown menu hidden in narrow displays #2035: the language menu will always be shown in the navbar for multilingual sites.
• Fixes [UX] Leave language dropdown menu in the top nav, use icon for title #2132: added the globe icon as suggested.
  • On mobile, uses language code as menu title
• Adds a placeholder language so that multilingual features can be demonstrated. Ensure that those pages are marked as noindex.
• Fixes placement issues with light-dark dropdown
• Hides the language menu from the sidebar by default. Legacy behavior can be recovered via config. See CHANGELOG for details.
• Removes overflow-hidden for the navbar on mobile. That'll not look super pretty, but it'll make obvious a feature that most users don't know exist: that the navbar can scroll! Feedback is welcome.

Preview: https://deploy-preview-2303--docsydocs.netlify.app/docs/

Screenshots

Mobile / narrow

Closed	Open

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Tablet

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Desktop

/cc @vitorvasc @theletterf @svrnm @tiffany76 - PTAL

[vitorvasc]

LGTM!

Nice catch on removing the overflow-hidden 😄

[LisaFC]

Oh that's excellent. I think the scrolly navbar on mobile works well.