Expand dev instructions to install the dev tools

[LynxJinyangii]

brew install pre-commit
brew install air
Jarl - see GitHub/website how go install it
brew install clang-format
brew install llvm # for clang-tidy
echo 'export PATH="/opt/homebrew/opt/llvm/bin:$PATH"' >> ~/.zshrc

[gregorgorjanc]

Done in #119