add a sub-component MaximizedChatboxComponent to display the maximized chatbox

Epic

• Axtrade completions
• Axtrade completions

Story

• As a logged user I want to maximize a chatbox
• As a logged user I want to maximize a chatbox

Steps

• edit this file
• create a subcomponent MaximizeComponent that renders a ChatboxGridItem
• add under the MaximizeComponent JSX code, the chatbox and the broadcast message component