Add Ceno cache to list of possible content sources
We should add one more possible content source to the current list of "Direct from Website" and "Via the Ceno network". The tentative description for this addition is "From the Ceno cache" and the count will be equal to the value "dist-cache" received from the web extension port. The current suggestion is to make the color for this source "blue" and its count will also be reflected in the progress bar, like the other sources. Here is a rough mock up of what it should look like, which can also be found in our figma board.