docs: update various bits of documentation #936
Merged
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Adds a diagram to ARCHITECTURE.md and gets rid of the BTF section, which is orthogonal to how the library is architected. It existed mainly to explaint why the package wasn't exported, but that is now moot.
Make CONTRIBUTING.md shorter (do people read these things?) and give a list of steps how to contribute a feature.
Update README.md to mention the btf package.