code: def raw_exchange_rates
        table_rows = Oga.parse_html(response.body).css('#ratesContainer li')
        # ADIB porvide 5 currencies on the home page (and 4 rows of info)
        fail ResponseError, 'Unknown HTML' unless table_rows&.size == 5
        currencies(table_rows).zip(rates(table_rows))
      end
docs: Send the request to the URL and retrun raw data of the response
   @return [Array<Array>] containing image url (currency) and exchange rates
     [
       ["/media/246206/usd.png", [["Buy: 18.1000", "Sell: 18.85"]]],
       ["/media/246211/gbp.png", [["Buy: 22.1019", "Sell: 23.1365"]]]
       ...
     ]