Move beta flag to be alongside title
Simplify title attributes on links and editions

Title help text isn’t necessary and distracts from table interactions
Add important notes to publication tables

Quickly see important notes without needing to navigate to the
publication
Improve styles of important notes

* Remove divider between title and tabs, the tabs themselves this
distinction
* Give the important note a title and make it less garish
Merge pull request #274 from alphagov/important-notes-tweaks

Improve design of important notes