Updated docs + made mpl swatch look more similar to bokeh swatch#2

Merged

jsignell merged 15 commits intomasterfrom docs

Nov 22, 2019

+237-172

Commits on Nov 11, 2019

moving docs around

story645
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jsignell
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hooks + doc amends

story645
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jsignell
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forgot to add PR template and some spellcheck

story645
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jsignell
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update with link to sample PR

story645
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jsignell
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spell check on readme

story645
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jsignell
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Getting rid of output
jsignell
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Fixing gallery
jsignell
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