feat: add docs.briefkastenhq.com to Showcase

[ndom91]

• Adds https://docs.briefkastenhq.com to showcase page
• Repo for docs site / fumadocs project: https://github.com/ndom91/briefkasten-docs

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Latest commit: 81fa19c

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Name	Status	Preview	Comments	Updated (UTC)
fumadocs	❌ Failed (Inspect)			Apr 27, 2024 2:59am