Change floating button action - replace Add New Feed (+) with Mark As Read (✓)

[gskoljarev]

• replace float button action as in title
• move "Add Feed" to the sidebar, above "Articles"

Great little app, devs!

[GLLM]

I would add that this "mark as read" button would be immensely more useful if it could act like a toggle (i.e mark as read or unread dependong on how the article is w.r.t it's read status) rather than simply marking unread articles as read ... The icon should adapt to the currently article read-ness status

As a matter of fact, I frequently spend time unhiding read articles (as i only show unread ones) to set as unread articles i want to re-read later. It's cumbersome.

Such button would be fantastic.