Align Markdown headers to the left.

[rabbitfr]

Hi,

I couldn't find a way to align Markdown headers to the left.

It appears related to table header rendering (center, left, right using ':'), but it doesn't seem configurable.

Great work, by the way!

[ajalt]

You're right, that's not currently configurable. It wouldn't be hard to support by adding a new theme entry. Although we'd want to support right alignment too, so we'd have to figure out how we'd want to represent that in the theme.