Layout and style the FiftyOne docs about fiftyone HOT 4 CLOSED

PyTorch's right sidebar nav is implemented by a custom theme: https://github.com/pytorch/pytorch_sphinx_theme/blob/master/pytorch_sphinx_theme/layout.html
Should be possible to adapt for our purposes

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@lethosor I think it's fine to get started based on the PyTorch theme (with our colors). Feel free to look for others if you'd like.

One of the less ideal things about the PyTorch RHS bar is that it doesn't automatically update to reflect the current section that you're reading. TF's does, for example. Also, I personally find the orange bar on the TF one helpful to draw attention to the presence of the table of contents over there. But, these are relatively minor things- the big goal is to avoid subsections of a page from appearing on the left, which is very cluttered.

A question we have is whether we want our top-level sections (user guide, tutorials, etc) to appear as choices across the top bar, or if the LHS table of contents is simple enough that all of that content can be listed over there. Like https://prodi.gy/docs, for example. Open for discussion

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@lethosor also, one important thing is to include the header and footer from the main website when rendering all of the doc pages.

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Resolved by #228 and #236!

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