Chatbot now allows you to use Iframe to display the contents of a website within the chatbot itself.
You can use the Iframe option in both the question node and the message node where we use the messages to the user option. 
Under the messages to user, clicking on the '+' symbol lists out options to choose from in which Iframe is one of the option.
Click on Iframe and enter the URL for the Iframe, save your changes by clicking on save flow.
This is how the Iframe enabled within a chatbot looks like 