fix[faustwp]: (#2043) update settings page documentation links

[latenighthackathon]

Description

The FaustWP settings page contains 8 links to faustjs.org using legacy URL patterns (/guide/*, /docs/next/*, /docs/faustwp/*) that rely on redirects to reach the current documentation structure. This updates all links to point directly to the current URLs.

Link mapping

Old URL	New URL
/docs/getting-started	/docs/how-to/basic-setup
/docs/next/getting-started	/docs/how-to/basic-setup
/docs/faustwp/settings	/docs/how-to/basic-setup
/guide/how-to-setup-post-and-page-previews	/docs/how-to/post-previews
/guide/how-to-use-the-faust-example-project	/docs/tutorial/learn-faust
/tutorial/get-started-with-faust	/docs/tutorial/learn-faust
/guide/how-to-use-apollo-in-faust	/docs/how-to/query-data-in-the-browser
/guide/how-to-handle-authentication	/docs/how-to/authentication

All replacement URLs verified against the live faustjs.org docs site.

Related Issues

Closes #2043

Testing

Confirm the issue (before the fix)

1. Check for legacy link patterns in settings files:

grep -n "/guide/\|/docs/next/\|/docs/faustwp/" plugins/faustwp/includes/settings/callbacks.php plugins/faustwp/includes/settings/views/headless-settings.php
# Expected on canary: 6+ matches using old URL patterns

Confirm the fix

2. Verify no legacy patterns remain:

grep -n "/guide/\|/docs/next/\|/docs/faustwp/" plugins/faustwp/includes/settings/callbacks.php plugins/faustwp/includes/settings/views/headless-settings.php
# Expected: no output

3. Verify all links now use current docs structure:

grep -n "faustjs.org" plugins/faustwp/includes/settings/callbacks.php plugins/faustwp/includes/settings/views/headless-settings.php
# Expected: all links use /docs/how-to/* or /docs/tutorial/* patterns

Run the test suites

phpcs:

cd plugins/faustwp && composer install && composer phpcs

JS tests:

npm install && npm run build && npm run test

[headless-platform-by-wp-engine]

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[changeset-bot]

🦋 Changeset detected

Latest commit: 543f8e1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@faustwp/wordpress-plugin	Patch

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