Allow users to pass the option displayMode true about remark-math

[uuykay]

Ok I just played around with it, and displayMode is supported by doing

$$
\\frac{r^3}{T^2} = \\frac{GM}{4\pi^2}
$$

I missed this because when writing displayMode in my files, I was doing

$$ \\frac{r^3}{T^2} = \\frac{GM}{4\pi^2} $$

[github-actions]

Hi! This was closed. Team: If this was fixed, please add phase/solved. Otherwise, please add one of the no/* labels.

[github-actions]

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— bb