Improve display of details and the items list

[bobbingwide]

Move the details above the items list and improve the styling of the image and content.

When an SB has been selected the detail is currently displayed at the bottom of the page, below the list.
It would be nicer to display it at the top of the display.
The image ( if any ) should come after the title and before the details.
Allow a maximum width of 800px.