Went through and ensured that undefined/null values were caught and handled correctly in render functions. Also documented some of the more complicated functions.
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Closes#1825
This PR adds multiple data to the dataset overview drawer provided by the config endpoint and formats them accordingly. The appearance of this new data is contingent on `dataPortalProps.corpora_schema_version === "1.0.0"`
For QA launch cellxgene with a remixed dataset and click on the button in the upper left-hand corner or the updated button in the info menu.

~~Review opening is blocked by merge of #1805~~
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Closes#1319