refactor: name and architecture change

[blessing-sanusi]

Purpose

• This pull request includes updates to the documentation and configuration files for the document generation solution accelerator. The most important changes include updating the architecture image in the README and simplifying the naming conventions in the azure.yaml configuration file.

Documentation updates:

• README.md: Updated the architecture image to DocGen_Azure_AI_Foundry_Architecture.png.

Configuration updates:

• azure.yaml: Simplified the environment and metadata names from Document-generation-solution-accelerator to document-generation.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation - NA

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

Deployment Validation - NA

• 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 - NA

• 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

[github-actions]

🎉 This PR is included in version 1.1.0 🎉

The release is available on GitHub release

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