TO DO: Dropdowns above timeline

Create a DropDown called #Goals using the loadGoalsDropdown() funtion in the current index.html page.

When #Goals changes, update the #chartVariable dropdown with the the DCID from corresponding tab in the Google Sheet.

#Goals dropdown > #chartVariable dropdown
Goal (Air) > Topic (Emissions): Subtopic (Methane)

Goals pulled from Google Sheet:

UN Goals

Air Topics

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