Add keywords for drone studies to yaml

[jennamk14]

Drone type(s) in keywords

[egrace479]

We do have some of this info in the yaml (here), but we do want to make sure key details from the Platform and Mission Specifications, such as hardware manufacturer, autonomy, nav pattern, sensor type, etc., are captured in keywords. We may want to think about best method to avoid over duplication.

[egrace479]

From our discussion yesterday: Drone information is in the yaml section, which allows easier, structured access to the information (the primary concern). We don't need to redundantly include it in the keywords, as searching for "drone" or "uav" data is sufficient.