Data table documentation

[ashjbarnes]

I've added a summary of how to use the data_table to the forcing page of the docs. I think this might be helpful for new users, as otherwise they need to know to look in the FMS / data_override repository and find the readme there.

[theresa-cordero]

This is a good addition to our documentation. I had one clarifying comment, but I think this is ready to be added.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (17f1c40) 37.19% compared to head (ca89042) 37.19%.

Additional details and impacted files

@@            Coverage Diff            @@
##           dev/gfdl     #551   +/-   ##
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  Coverage     37.19%   37.19%           
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  Files           271      271           
  Lines         80346    80346           
  Branches      14982    14982           
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  Hits          29887    29887           
  Misses        44902    44902           
  Partials       5557     5557           

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[marshallward]

Thank you @ashjbarnes, someone within GFDL just asked me for something like this a few weeks ago. I think this will certainly be appreciated by others.

[marshallward]

This does not run the model so no regression testing is required.

These three commits will be squash-merged.