142 App config util

[mwarman]

📢 Instructions

• Begin with a DRAFT pull request.
• Follow italicized instructions to add detail to assist the reviewers.
• After completing all checklist items, change the pull request to READY.

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🔧 Change Summary

Describe the changes included in this pull request. Link to the associated GitHub issue(s).

• fixes App config util #142
• Added the config utility for schema-based validation of the application configuration.
• Removed the old approach using a configuration React context provider and hook.
• Updated project documentation.

📝 Checklist

Pull request authors must complete the following tasks before marking the PR as ready to review.

• Complete a self-review of changes
• Unit tests have been created or updated
• The code is free of [new] lint errors and warnings
• Update storybook stories as needed
• Update project documentation as needed, README, JSDoc, etc.

🧪 Steps to Test

Describe the process to test the changes in this pull request.

1. Start the application.
2. Ensure that the application starts successfully (it will fail to start if the application configuration utility finds any problems.)

🔗 Additional Information

Optionally, provide additional details, screenshots, or URLs that may assist the reviewer.

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