Change path to background image

[shalingams]

Description

Type of Change

• 📄 New content addition
• ✏️ Content update/revision
• 📚 Structure/organization improvement
• 🔤 Typo/formatting fix
• 🐛 Bug fix
• 🔧 Tooling/config change (docs build, CI/CD, etc.)
• Other (please describe):

Motivation and Context

Areas Affected

• e.g., docs/getting-started.md, docs/configuration/

Screenshots (if applicable)

Checklist

• I have read the CONTRIBUTING guidelines
• My changes follow the project’s documentation style guide
• I have previewed my changes locally (mkdocs serve or equivalent)
• All internal/external links are valid
• Images/diagrams are optimized (size, format) and display correctly
• Any new references/resources are cited appropriately
• All existing checks/tests pass (if applicable)

Additional Notes

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By submitting this pull request, I confirm that my contribution can be used, modified, and redistributed under the terms of this project’s license.