feat(docs): fetch conn string (#34492)

* feat(docs): fetch conn string

Add option to ProjectConfigVariables to fetch the Supavisor session mode connection string, for setting up MCP server

* docs(mcp): reminder to replace password placeholder in connection string

* fix: display helpful message if project paused

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Co-authored-by: Greg Richardson <greg.nmr@gmail.com>

apps/docs/types/utils.ts

@@ -0,0 +1,3 @@
+export type ReadonlyRecursive<T> = {
+  readonly [P in keyof T]: ReadonlyRecursive<T[P]>
+}