fix: supabase integration guide links

[DominicGBauer]

Description

It appears this https://docs.powersync.com/integration-guides/supabase link has changed to https://docs.powersync.com/integration-guides/supabase-+-powersync so users were being redirected to the overview page. This fixes the links to map to the correct guide.

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Latest commit: c0fcbef

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[benitav]

Thanks Dom, I saw this old link in the Dashboard too the other day. Can you maybe also add a redirect on the mintlify docs for this - that should ensure existing old links out there will continue to work: https://github.com/powersync-ja/mintlify-docs/blob/docs/mint.json#L428