Write documentation for code

[sahilsuman933]

Description

• Added a new documentation page detailing best practices for managing AI assistant configurations across DEV, UAT, and PROD enterprise environments.
• Updated the documentation navigation to include the new guide under the "Best practices" section.

Testing Steps

• Run the app locally using fern docs dev or navigate to preview deployment
• Ensure that the changed pages and code snippets work

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[github-actions]

🌿 Preview your docs: https://vapi-preview-0154c693-2392-49f5-9dfa-4b82dd404117.docs.buildwithfern.com