text: Title: chat frontend no longer active, fix readme
  Body: From Readme:
  
  > How To Try It Out
  > Chatting with the AI
  > 
  > The chat frontend is now live [here](https://open-assistant.io/chat). Log in and start chatting! Please try to react with a thumbs up or down for the assistant's responses when chatting.
  
  but the link now leads to the `OpenAssistant has finished!` page, without allowing you to try the model