Fix archive urls

Some links in the r1 archived pages are broken. There's three types of these links I've fixed.

From the code,

```
 /**
  * We moved some R1 HTML files from subdomains to www.theguardian.com.
  * This means we broke some of the <a href="...">'s in the HTML.
  *
  * Here's how this works :-
  *
  * 1. /Books/reviews/travel/0,,343395,.html -> /books/reviews/travel/0,,343395,.html
  *       - Downcase the old subdomain paths.
  *
  * 2. /Film_Page/0,,594132,00.html -> /film/Film_Page/0,,594132,00.html
  *       - Prefix the current section to any links without a path in them.
  *
  * 3. /Guardian/film/2002/jan/12/awardsandprizes.books -> /film/2002/jan/12/awardsandprizes.books
  *       - The /Guardian path is an alias for the root (www), so we just remove it.
  *
  * 4. http://...
  *       - Ignore any links that contain a full URL.
  */
```