The "io" repo shares js and css folders with the modelearth/localsite repo.
Place both "io" and "localsite" in your webroot directory.
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Open a command prompt in the webroot folder that contains both "localsite" and "io". 
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Run python -m http.server 8887in your webroot. You can add more repos to your webroot.
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View at http://localhost:8887/io/charts