Docs: Updating n8n Integration Guide to add Video Walkthrough

[SarahScargall]

Purpose of the change

Enhance the n8n Integration Guide by embedding a visual walkthrough video to assist developers in setting up persistent AI agents.

Description

This PR adds an iframe component to the n8n.mdx file containing a step-by-step video demonstration.

Fixes/Closes

Fixes #1113

Type of change

• Documentation update

How Has This Been Tested?

• Manual verification (list step-by-step instructions)

Test Results: Verified via local Mintlify preview. Confirmed that the video renders correctly at the bottom of the n8n integration page and that all tables remain scanable and parseable.

Checklist

• I have signed the commit(s) within this pull request
• My code follows the style guidelines of this project (See STYLE_GUIDE.md)
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have checked my code and corrected any misspellings

Maintainer Checklist

• Confirmed all checks passed
• Contributor has signed the commit(s)
• Reviewed the code
• Run, Tested, and Verified the change(s) work as expected

Screenshots/Gifs

Screenshot 1 - n8n.mdx section showing the new Video Embedded:

Further comments

The video was placed above the 'Observability & Tracing' section to bridge the gap between basic node setup and advanced monitoring.