removes parameters from res.redirect routes as they are not accepted and adds pageTitle and username parameters to all render routes and gives them values
gets two navbars sorted out, logged in and logged out
navbar is fine
allows public search, still has private user account area
changes username = req.body.username to req.user.username to retrieve username
adds book background image, forces it to cover and scale
has default background if image fails
corrects problem with trying to get username for non-logged-in user