Revert "Add Google Analytics"

This reverts commit bd355599c7.

src/Progress.js

@@ -182,11 +182,6 @@ export default withRouter(class Progress extends React.Component {
 		this.setState(newState, () => {
 			if (!setDone) this.answerInput.focus()
 		});
-
-		this.props.logEvent("select_content", {
-			content_type: "progress",
-			item_id: this.props.match.params.progressId,
-		});
 	}
 
 	componentWillUnmount() {