Feature/reader vertical pager keyboard bindings scrolling (#452)

* Scroll up when clicking shift + space

* Add keyboard bindings to arrow up and down

Align scroll amount with using other keys like space, arrow right/left

* Add scroll inversion with shift to other key bindings

* Scroll per mouse dragging

src/components/reader/Page.tsx

@@ -55,6 +55,7 @@ function imageStyle(settings: IReaderSettings): any {
         minWidth: '50vw',
         width: dimensions.width < dimensions.height ? '100vw' : '100%',
         maxWidth: '100%',
+        pointerEvents: 'none',
     };
 }