docs: add custom theme configs for docs

[r3nanp]

Add some custom configs for docs

• Add links
• Add SEO Props

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Name	Status	Preview	Comments	Updated
trpc-swr	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 27, 2023 at 8:27PM (UTC)

[sannajammeh]

Thanks for the PR!