docs: Add documentation for deploying with limited Azure OpenAI quota

[Kanchan-Microsoft]

Purpose

This pull request adds a new documentation file to help users deploy the Modernize Your Code Solution Accelerator when their Azure OpenAI quota is limited. The document provides step-by-step instructions for bypassing or lowering quota validation thresholds, ensuring users can deploy successfully even with reduced capacity.

New documentation for quota-limited deployments:

• Added docs/DeployWithLimitedQuota.md to guide users on deploying with lower Azure OpenAI model quota, including two options: removing quota validation or lowering the quota threshold in infra/main.bicep.
• Included configuration steps and performance considerations for deployments with reduced quota.
• Linked to related resources for deployment, quota checking, and advanced configuration.
• Explained the rationale behind quota validation and how to work around it for successful deployment.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Golden Path Validation

• [ ] I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• [ ] I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

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