docs: update managed Postgres settings & scaling for beta

[mintlify]

Summary

Port ClickHouse/clickhouse-docs#6285 — highlight that scaling and IP filters live on their own pages and update the Managed Postgres settings page for Beta.

Changes

• products/managed-postgres/scaling.mdx: added storage-headroom safety <Tip> under the instance-type selection table.
• products/managed-postgres/settings.mdx:
  • Reordered so Service actions and scaling comes before Changing configuration parameters.
  • Replaced the inline scaling description with a link to the scaling page.
  • Removed the duplicated storage-headroom tip (now on the scaling page).
  • Removed the IP filters section (already covered on a dedicated page).
  • Added a closing paragraph linking to the official PostgreSQL runtime-config docs and ClickHouse support.

Context

The link in settings.mdx uses /products/managed-postgres/scaling to match this repo's existing internal link convention; the upstream source used /cloud/managed-postgres/scaling (the file's slug), which the link checker flagged as broken here.

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Note

Low Risk
Documentation-only edits with no product, auth, or data-path changes.

Overview
Reorganizes Managed Postgres beta docs so Settings focuses on service actions and parameters, while scaling and IP filters are documented on their dedicated pages.

On settings.mdx, Service actions and scaling now appears before Changing configuration parameters; the long scaling/failover blurb is replaced with a link to the scaling guide, the duplicated storage-headroom tip and entire IP filters section are removed, and a closing note points readers to PostgreSQL runtime-config docs and ClickHouse support for unsupported parameters.

scaling.mdx gains a Tip under the instance-type table warning that you may be blocked from downsizing storage when used capacity leaves little headroom.

security.mdx replaces the cross-link to Settings for IP filter setup with the same numbered UI steps, keeping IP whitelisting self-contained on the security page.

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