v2.3.1

Changelog

39a45e3 📖 document how to udpate kubebuilder book
18fb351 📖 note multiversion kubectl behavior
46e9db0 Add Adirio as a reviewer
60deebb Add logos to book
8b726b0 Added explanatory note about the index
ec671a5 Clarifying a sentence re: backwards compatability
b2a1f45 Delegate config checks to the config model
43c42a5 Include the missing envtest import.
7d747cf add mock testdata for plugins with --pattern=addon
6c89111 bump kube-rbac-proxy to v0.5.0
5c754a3 declarative pattern: Support cluster scoped types
231408e fix pattern addon template
095ce7b fix: master branch broken ci - update testdata
b70e9ca improvements for contributors
3e39118 internal/config/config.go: use DefaultVersion instead of version string directly