Add starlight theme nova

[ocavue]

Description

This PR adds a new theme https://github.com/ocavue/starlight-theme-nova to the docs.

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Latest commit: e0bb942

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Tracked Files

Locale	File	Note
en	resources/themes.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[delucis]

Thanks @ocavue! Looks amazing 🤩