Update AI landing page to include PaaS and AI Specialized Workload Patterns sections

[Akiliu0512]

Overview/Summary

Update AI landing page to include AI on Azure Platforms (PaaS) and AI Specialized Workload Patterns sections

This PR fixes/adds/changes/removes

1. Replace me
2. Replace me
3. Replace me

Breaking Changes

1. Replace me
2. Replace me

As part of this Pull Request I have

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

[Akiliu0512]

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