feat(devnet): init core explorer

[johnletey]

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch devnet/core-explorer

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[johnletey]

Okay, looks like Railway doesn't support git submodules -- going to try out GitHub Pages 😄

[johnletey]

Closing this in favor of a dedicated repository for deployment on Railway!