Update Guide to UFS weather model

[arunchawla-NOAA]

Description

The UFS weather model guide is out of scope

Solution

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The UFS weather model guide under READTHEDOCS needs to be updated to include an overview that represents its current state --

  -- atmosphere model
  -- ocean model
  -- ice model
  -- wave model

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[DeniseWorthen]

I've made a start on adding the Input/Outputs for the coupled model. I finally was able to build my branch on RTD. I ended up having to add a .readthedocs.yml file to the root directory otherwise I kept getting build errors about sphinxcontrib-bibtex.

This is what I have currently on my RTD project page: rtd