docs: use supabase docs as source of truth

[raulb]

What kind of change does this PR introduce?

• Docs update.
• Updates mgmt-api types

mcp-server-supabase/ on raulb/minor-readme-update
› pnpm generate:management-api-types

> @supabase/mcp-server-supabase@0.8.2 generate:management-api-types /Users/rb/code/supabase/mcp/packages/mcp-server-supabase
> openapi-typescript https://api.supabase.com/api/v1-json -o ./src/management-api/types.ts

✨ openapi-typescript 7.9.1
🚀 https://api.supabase.com/api/v1-json → ./src/management-api/types.ts [889.4ms]

What is the current behavior?

This content exists in both the repo's readme and public docs.

What is the new behavior?

Leave a link for reference.

[coveralls]

Coverage Report for CI Build 28798656122

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Coverage: 96.243%

Details

• Patch coverage: No coverable lines changed in this PR.

Uncovered Changes

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Coverage Regressions

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Coverage Stats

Relevant Lines:	2820
Covered Lines:	2735
Line Coverage:	96.99%
Relevant Branches:	347
Covered Branches:	313
Branch Coverage:	90.2%
Branches in Coverage %:	Yes
Coverage Strength:	41.36 hits per line

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💛 - Coveralls