IJM: expand all sections

[sianroderick]

The current design collapses the full text page header content. This impacts searching the full article using CTRL+F as each header needs to be opened manually. We would like CTRL+F to work for the whole page in a single search.

[sianroderick]

IJM has confirmed that they would be happy for all sections to be expanded by default (if that's the right solution to their search problem).