The websocket connection for the exchange rate on the other hand, does not include any address, UTXO data. Simply just grabbing the US dollar exchange rate.
I see, but IMO it's better mention the live demo access several 3rd party website (bitfinex for exchange rate and google for font) for optional feature.
That is not true. It does not access google for font or any 3rd party for font. I will add a note that Bitfinex is used for the exchange rate.