Revert "Google analytics stored in js file."

This reverts commit 7abc41af0c7ecb71554462c31f7ff7a5d76f488d.

fixes #5796
Make product slug index unique.
default_scope expects a block as its sole argument

fixes #5799
Eagerly load product images and prices using preload.

(i.e. explicitly using a separate query) so the orders are respected even when
the product search is conditioned on an included association.

fixes #5798