Make headings with with long extra block and meta

A long extra side block would push the medata data way down the page.
This should bring it back up and under the title.
Improve styling of topical event documents

- Handle the case there is only one block of documents to put in the
  grid.
- Clear document blocks when there are more than 2 blocks
- Reduce it to only 3 documents per block so it matches organisations
  more