Migrate CytoDataFrame from coSMicQC as standalone package

[d33bs]

This PR migrates CytoDataFrame from coSMicQC as standalone package (with coSMicQC as a dependency).

Some notes:

• I tried to keep the code relatively unchanged where possible.
• Docs have been updated to have a different look and feel from coSMicQC to prevent confusion.
• We're unable to create multiversioned docs yet until we have a first version (see Update docsite to use sphinx-multiversion (post initial release) #3)
• I've prepared a "pending" project for PyPI, meaning that we don't yet have a release there but will once we trigger the process from a GitHub Release. Once the project is available on PyPI the dead links in this PR will be active.

Closes #1
References WayScience/coSMicQC#108

[d33bs]

Thanks again @jenna-tomkinson for your review of related code from within #6 . As I mentioned in that PR, I'm going to move forward with a merge here under the presumption that your approval cascades here. If I misinterpreted or you feel we should change things please don't hesitate to let me know.