docs: add starlight-site-graph and starlight-theme-obsidian

[Fevol]

Description

This PR adds my two (now as-good-as-finished) plugins to the community resources.
Announcement of the 'release' of the plugins will also be made tomorrow in the Discord.

Links to the plugins:

• https://github.com/Fevol/starlight-site-graph (website)
• https://github.com/Fevol/starlight-theme-obsidian (website)

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Latest commit: ceecf65

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Tracked Files

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en	resources/plugins.mdx	Source changed, localizations will be marked as outdated.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.

[HiDeoo]

Thanks for the amazing additions to the Starlight showcase, amazing work 🤩