Editor improvements

We've made it far easier to quickly edit and extend your brand guidelines. We're hoping this helps speed up everyone's workflows:

• Sections can now be copied, letting you paste them elsewhere on your page, or anywhere in Guidelines, even a different site.
• Individual blocks can also all be copied, pasted into the same section, new sections, or entirely different pages and sites.
• Text can now be pasted directly onto a section, creating a new Text Block. Previously it needed to be pasted directly into a text block, this makes editing that little bit faster.
• Command-D (or Ctrl-D on Windows) can now be used to quickly duplicate a block or a section.
• Alongside a few minor bugfixes and improvements.