Add clarification about using / for image paths relative to fern folder root

[devin-ai-integration]

Add clarification about using / for image paths relative to fern folder root

Summary

Added a new "Image paths" subsection to the Images documentation clarifying that users can reference images using / for paths relative to the root of the fern folder (e.g., /assets/images/overview.png) instead of only using relative paths (./ or ../). This provides a more concise alternative that doesn't depend on the current page's location in the folder structure.

Review & Testing Checklist for Human

• Verify the / path syntax actually works - Test that /assets/images/filename.png correctly resolves to fern/assets/images/filename.png from various page locations in the documentation
• Check documentation clarity and placement - Ensure the new subsection reads clearly and is logically placed after the image examples
• Review Vale/CI checks - Ensure all linting and style checks pass (Vale wasn't available locally to pre-validate)

Test plan

Build the docs locally (fern docs dev) and verify that:

1. Image paths using / syntax work correctly from different page locations
2. The new documentation section renders properly
3. The example is clear and helpful

Notes

• Requested by: Devin Logan (devin.logan@buildwithfern.com) / @devalog
• Link to Devin run: https://app.devin.ai/sessions/c9aeaffa120c48e384512834d25d099c
• Original request from Catherine Deskur in Slack #documentation thread

[devin-ai-integration]

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