Separate templates for World and UK

[tef]

Well, almost

I've put a conditional include inside template.html, which allows for including an extra css file depending on region, and the legalese is now included via a --include-after-body option for pandoc.

But it would be nice to split out the formatting layout css and the heading colours into separate files

[tef]

Things we need to do

• [ ] Colour scheme
• [ ] Legalese text (Clare has a copy)

[tef]

Done!