Assuming dark backgrounds may be a bad assumption

[trashhalo]

On this line I am hard coding the markdown output as "dark". This may be the wrong choice for people with light backgrounds. https://github.com/trashhalo/readcli/blob/master/main.go#L30

Look into glow's source code to figure out how they are detecting terminal colors and port it to readcli. https://github.com/charmbracelet/glow