Sphinx & docs quality

[billbrod]

Make sure everything looks the way we want it to (types render correctly, math renders correctly, all links are valid)

[NickleDave]

Adding typos on this issue

In https://plenoptic.readthedocs.io/en/latest/tutorials/intro/02_Eigendistortions.html#1.1)-Creating-the-model

• :nbsphinx-math:`begin{align}

  y &= f(x) = Mx, && text{$Min mathbb{R^{mtimes n}}$}.

end{align}`