docs: Update Stork Integration

[calldelegation]

No description provided.

[cursor]

PR Summary

Low Risk
Low risk documentation/config-only changes that adjust external links and a quickstart list; the main risk is broken or unintended link targets in navigation.

Overview
Updates Solana/Ledger guide wording by removing an inline Phantom Help Center link and pointing users to Phantom’s main support site instead.

Refreshes ecosystem docs and site navigation: removes the V12 entry from the user quickstart, drops Sway Core Lib from external navigation, and switches Sway By Example from an external URL to the internal /docs/sway-by-example-lib page (also removing the core library submenu link).

^{Written by Cursor Bugbot for commit 9a300e0. This will update automatically on new commits. Configure here.}