Read/Unread gradient and Topic/Replies tabs

[atreestump]

Since adding the sorting toggles I decided that 'New' and 'Unread' don't make sense anymore so these tabs now display Topics and Replies.

In the Topics Tab you will see the latest topics with the opening post visible. In the replies tab you will see a preview of the latest reply and it wll show the authour of the reply.

Feed cards now glow Red if you haven't read it yet and Green when you have read it.

There will also be more information in Agora view showing the latest topic and reply.

I will be adding a history tab which will show everything you have interacted with in order.