Missing documentation on how it works under the hood

I don't see any documentation on how Chalice works under the hood, is there any plans for this? I need to modify the underlying code and possibly consider forking to add custom features for my development team

The issue names no files, tests, or entry points. Start by reviewing the existing Chalice documentation and identifying which parts of the underlying implementation need explanation; done should mean an agreed scope and documentation that explains how Chalice works under the hood for developers modifying or extending it.

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