89 Error boundary

[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

List the changes included in this pull request.

• Issue: Display error if configuration validation fails #89
• Addresses 🐞 issue found when starting the app with invalid configuration.
• Adds an application-wide Error Boundary which renders an ErrorPage component.

📝 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

🧪 Steps to Test

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

1. On a local machine, comment any required configuration variable and run the application.

🔗 Additional Information

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

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