Add starlight-heading-badges & @hideoo/generator-starlight-plugin to the plugin showcase

[HiDeoo]

Description

This PR adds the following resources to the plugin showcase:

• starlight-heading-badges: plugin to add badges to Markdown headings
• @hideoo/starlight-plugin: Yeoman generator to quickly scaffold a new Starlight plugin

[changeset-bot]

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Latest commit: d486f89

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Tracked Files

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Warnings reference

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🔄️	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 @HiDeoo!