Function refresh

public/lemon.js:69–71

* Refresh should be called in cases where a buy button may not have existed on initial load * Such as in an SPA, this can be called when a component is mounted.

()

         * Such as in an SPA, this can be called when a component is mounted.
         */
        function refresh() {
            listenForButtons();
        }

        /**
         * Adds event handlers to all lemonsqueezy buttons