Document "equation_numbering"

[verga]

I found that adding to pelicanconf.py the option

'equation_numbering': "AMS"

to the item

MATH_JAX = {...'equation_numbering': "AMS",...}

allows equations to be numbered if displayed with, for example,

\begin{equation}\label{eq}a+b=1\end{equation}

Otherwise the default value of equation_numbering is 'none', and numbering is suppressed. As a consequence $\eqref{eq}$ would return (???), instead of the equation number (1).

It could be useful to document this setting.