layout: remove justify

The way `justify' was implemented just made text annoying to read.
(The algorithm of distributing spacing evenly does not really work
on a cell-based screen because of rounding errors.)

CSS 2.1 says:

> Conforming user agents may interpret the value 'justify' as 'left' or
> 'right', depending on whether the element's default writing direction
> is left-to-right or right-to-left, respectively.

Since we have no bidi yet, just interpret it as `left'.

Maybe in the future we could add an implementation that tries to align
line box lengths instead of their contents, but this will probably be
difficult to get right.

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