Home Page Model Selection and Multiple Tab Support

[JEYuhas]

First Draft of MultiTabs in HARP. Add tab button is in top right corner. Will be moved.

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[cwitkowitz]

I've not thoroughly reviewed this PR, but here are some minor issues I noticed:

• If model loading is unsuccessful, the corresponding tab should not be opened.
• The sizing of the categorization tags is off.
• Leftover from the previous dropdown feature, if model loading is unsuccessful, a failure tag (e.g., [SLEEPING]) is appended to the URL and causes all subsequent load attempts to fail.
• I wonder if there is a better way to read in the list of valid models. See the model validation PR (Model Validation Infrastructure, Script, and Workflow #432) for ideas. We also may be able to use the same infrastructure to only display models that will load successfully.