Supabase docs recommend pg_partman but the extension is not available on Supabase

[evelant]

Bug report

• [ X] I confirm this is a bug with Supabase, not with my own application.
• [ X] I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

The docs on partitioning recommend pg_partman as a useful tool for managing partitioned tables but Supabase databases don't have pg_partman available as an extension.

To Reproduce

N/A

Expected behavior

The pg_partman extension should be available or the docs should remove the mention of it since it creates confusion.