Archive server handles relative r1 URLs

Because we are moving documents across subdomains any non-relative URLs are liable to breaking.

This fixes the bulk of them, so...

www.theguardian.com/books/Education/gendergap/story/0,,912573,00.html

...becomes a 301 response pointing at,

www.theguardian.com/education/gendergap/story/0,,912573,00.html
WIP cleaner of inbody links
Start to correct some of the r1 hyperlinks that broken in the domain move
Fix URLs from subdomains missing their sections
Improve the notes on how this works
Merge branch 'master' of github.com:guardian/frontend into fix-archive-non-relative-urls

Conflicts:
	common/app/views/support/package.scala
Merge pull request #3333 from guardian/fix-archive-non-relative-urls

Fix archive urls