Split Customize Copilot article into separate articles

* Add a ToC subsection in Copilot: Customization
* Split [Customize Copilot](https://code.visualstudio.com/docs/copilot/copilot-customization) article into
   * Instructions
   * Prompt files
* Move [Chat modes](https://code.visualstudio.com/docs/copilot/chat/chat-modes) article under Customization ToC node
* Update [customization section of Copilot Overview](https://code.visualstudio.com/docs/copilot/overview#_customize-the-ai-to-your-workflow) article

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Split Customize Copilot article into separate articles #8742

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Split Customize Copilot article into separate articles #8742

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