Define and demonstrate data transform types within documentation

[d33bs]

Description

This PR adds further clarification surrounding the use of data transformation terminology within CytoTable to resolve #13 . While these were developed, I noticed that HTML tables required CSS styling, resulting in the CSS modifications.

Thanks for any thoughts or feedback you may have!

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• Bug fix (fixes an issue).
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[gwaybio]

LGTM after some minor clarification updates

[d33bs]

Thanks @gwaybio for your review! Made some updates based on your comments and going to merge.