Many updates and improvements

- yamllint
- shfmt config
- fix Go bin path
- fix git credentials config
- add nvm default packages
- updated Brewfile

local/bin/x-validate-sha256sum.sh

@@ -50,4 +50,3 @@ elif [ "$(get_sha256sum "$filename")" = "$file_hash" ]; then
 else
   error "$filename doesn't match provided sha256sum"
 fi
-