Anchor Compatibility with Scroll Products

The main section identifier is set on the DIV element that encloses the section title and section body. Scroll products assume that the identifier is set to the header.

To be compatible with Scroll we will set the heading identifier (currently suffixed with "-head") to the main identifier (no suffix). The section DIV will be suffixed with "-start".

We also need to render an anchor for sections that hide their section title.