docs(scaffold-stellar): Embed intro video in Installation section

[Copilot]

CLI install takes several minutes, leaving users idle with no context. Adds an embedded YouTube intro video to the Installation section so devs have something relevant to watch while dependencies install.

Changes

• Imported the existing YouTube component into scaffold-stellar.mdx
• Embedded <YouTube ID="86hWe8Ragtg" /> at the bottom of the Installation section, after the cargo-binstall tip and before "Creating a New Project"

While the CLIs are installing, check out this intro to Scaffold Stellar!

<YouTube ID="86hWe8Ragtg" />

Original prompt

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This section details on the original issue you should resolve

<issue_title>Scaffold Stellar: Add a 90 second Intro to Stellar video for people to watch while the cli tools are installing</issue_title>
<issue_description>

I'm a first time user of Scaffold Stellar following this guide: https://developers.stellar.org/docs/tools/scaffold-stellar#installation

I noticed that it takes quite a while (a few mins at least) to install the required CLI tools.

What problem does your feature solve?

Give devs something relevant to do while cli and registry install => "While the clis are installing, check out this 90 second intro to Scaffold Stellar!"

What would you like to see?

Add a video to the docs - either something from https://www.youtube.com/playlist?list=PLmr3tp_7-7Gjj6gn5-bBn-QTMyaWzwOU5 or a new 90 second video quickly intro-ing Scaffold Stellar and the things they can build with it.

What alternatives are there?

Leave the page as is and risk dropoff due to long install time
</issue_description>

<agent_instructions>Embed this https://www.youtube.com/watch?v=86hWe8Ragtg intro video at the very bottom of the Installation section so that devs can watch while they wait for dependencies to install</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@briwylde08 https://www.youtube.com/watch?v=86hWe8Ragtg

• Fixes Scaffold Stellar: Add a 90 second Intro to Stellar video for people to watch while the cli tools are installing #2247

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[Copilot]

Pull request overview

This PR addresses the issue of users waiting idle during the CLI installation process by embedding an introductory YouTube video in the Installation section of the Scaffold Stellar documentation. The video provides relevant content for developers to watch while their dependencies install.

Changes:

• Added YouTube component import to the scaffold-stellar.mdx file
• Embedded the intro video (ID: 86hWe8Ragtg) with contextual text at the end of the Installation section

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