Layout of new docs site

I appreciate the work that's gone into making the docs site look a bit more modern, but I think it's actually taken a bit of a step back in usability.  The content is now squeezed into a fairly narrow section in the middle of the page.

I think it would be better to that the menu bar pinned to the left and allow the content to fill the rest of the of page.  I'm not too fussed about having the table of contents bar that's appeared on the right, maybe it could be moved to the top of the doc to avoid it taking up page on the right hand side.

Dave