Remove `line-height` from `body`

[benoitchantre]

The line-height property with a value of 1.5 is a good default value, but maybe something opiniated that could be removed, because it will certainly be adjusted according to the design needs.

Another reason is that WordPress (and maybe other tools) allows us to generate some styles from a json file. As these base styles are declared before any other stylesheet, we can't use the generated value for line-height because it will be loaded too early and overloaded.

Would you accept a PR to remove that property?

[julianjohannesen]

I think the line-height of at least 1.5 is designed to meet accessibility standards, especially in the context of blocks of text where the font-size is fairly small. Sure, it's opinionated, but at the same time, it's something that designers really aught to embrace, especially at small font-sizes.

Obviously, line-height: 1.5 isn't going to work for headings, which is why some people are suggesting using line-height: calc(1em + .5rem). This setting satisfies the need for readable text at smaller font-sizes, but also produces tighter leading on headings.