docs: Add documentation for deploying with limited Azure OpenAI quota

[Harsh-Microsoft]

Purpose

This pull request adds a new documentation file to help users deploy the Document Generation Solution Accelerator when their Azure OpenAI quota is limited. The guide explains how to adjust or bypass quota validation to enable deployment with less capacity, and provides step-by-step instructions for modifying infrastructure files and environment variables.

Documentation improvements:

• Added docs/DeployWithLimitedQuota.md, a comprehensive guide covering deployment with limited Azure OpenAI quota, including instructions for removing or modifying quota validation in infra/main.bicep, configuration steps, and performance considerations.

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

• [ ] I have built and tested the code locally and in a deployed app
• [ ] For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• [ ] This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information