remove banner from main page

[matebarabas]

Overview/Summary

Removing old banner from main page

This PR fixes/adds/changes/removes

1. removes old banner from main page

Breaking Changes

n/a

As part of this Pull Request I have

• [x] Read the Contribution Guide and ensured this PR is compliant with the guide
• [x] Checked for duplicate Pull Requests
• [ ] Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• [x] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x] Ensured PR tests are passing
• [x] Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[microsoft-github-policy-service[bot]]

[!IMPORTANT] The "Needs: Triage :mag:" label must be removed once the triage process is complete!

[!TIP] For additional guidance on how to triage this issue/PR, see the AVM Issue Triage documentation.