[Docs] Use OptiPNG to shrink PNG images losslessly

So they load slightly faster.  :-)

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diff --git a/docs/static/img/stou-tn.png b/docs/static/img/stou-tn.png
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diff --git a/docs/static/img/thehome.png b/docs/static/img/thehome.png
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diff --git a/docs/static/img/yslow-rules.png b/docs/static/img/yslow-rules.png
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