When submitting a markdown image it stretches and breaks the chat-widget


<img width="433" alt="Screen Shot 2021-04-21 at 2 50 59 PM" src="https://user-images.githubusercontent.com/4218509/115605916-19299a00-a2b1-11eb-8853-95371f175122.png">

Related to this issue https://github.com/papercups-io/chat-widget/issues/90