Reducing the reiquired width of help documentation's images

For now, the required width is 11 in (1584px).

The width of A3 page is 11.7in. Left and right margins are 1 in each. So the required width should be 11.7 - 2*1 = 9.7 in (1397px). The size of an image doesn't affect its display size in the app. However it affect the resolution of the image in the app and the size of the saved pdf file when saving the help documentation