docs: add starlight-custom-navigation to plugins showcase

[frostybee]

Adds starlight-custom-navigation to the community plugins list.

This plugin adds side navigation strips, floating buttons, keyboard shortcuts, and swipe gestures for moving between pages.

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Latest commit: 9d0d7ca

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[delucis]

Thanks for the adding this plugin @frostybee! 🎉

Heads up that in the demo site, the ctrl+left/right shortcuts didn’t work for me (Chrome on macOS), but everything else did.

[frostybee]

Thanks for letting me know @delucis

It's been fixed in v1.0.1