feat: only warn about missing keys

[ojeytonwilliams]

• chore: use colours to better differentiate logs
• chore: downgrade oauth2.keys.json error to warning

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• [x] My pull request has a descriptive title (not a vague title like Update README.md).
• [x] My pull request targets the main branch of Chapter.

The main thing is we can't rely on oauth2.keys.json existing. Notably it won't exist in railway, so we need an alternative approach.

For now, I just want to downgrade the error to a warning. Longer term we could make use of environment variables, but I'm focusing on getting the MVP deployable for now.

[ghost]

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[ojeytonwilliams]

I added the colours to (hopefully) make it easier to read the logs that concurrently produces. If anyone hates them, feel free to revert that change.