UI improvements

[EnriqueJRodriguez]

I have revised the deployed version of the chat after all the material addons, I think we should work on some things:

• Improvement of the UI, colours and sizes, I will work on that.
• The user must be able to delete chats form the list, some message must be prompets beforehad if thery are sure if they really want to delete all data related to the chat.
• Also users must be able to know what chat are they using.
• we must work on a better icon, the resized one is not godd as the app as a whole, we shoud think a more simple one for the small tab icon.

If you find any other minor issue please write it doen here.