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Download shapefiles archives from the Miami-Dade Self-Service GIS: http://gisweb.miamidade.gov/GISSelfServices/GeographicData/MDGeographicData.html
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Convert shapefiles to geoJSON at http://shpescape.com/mix/ (upload the .zip)
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Click download. When geoJSON file opens in browser, copy its content to a .geojson file
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Once geoJSON file is pushed to Github, you can see it as a map by clicking on the file and then selecting the paper icon if it is not already selected.
If you have issues displaying map, use the geoJSON Linter: http://geojsonlint.com/ to test your data.