markdown lint vale configuration

1. using mason install vale
2. sync the vale package for the first usage

$ mkdir ~/.config/vale/.vale.ini
$ vim .vale.ini

# add those

# sync Styles to the global config
StylesPath = .
MinAlertLevel = suggestion
Packages = RedHat, alex
[*]
BasedOnStyles = Vale, RedHat, alex

1. sync the mason package with global config

~/.local/share/nvim/mason/packages/vale/vale --config=$HOME/.config/vale/.vale.ini sync

Reference

vale
nvim-lint issue