Doc: improve links to advanced topics.
First attempt
Merge pull request #458 from matthewrmshin/rose.html#advanced

Doc: improve links to advanced topics.
Merge branch 'master' of github.com:metomi/rose into metomi-gh-pages
Merge pull request #460 from benfitzpatrick/doc.syntax-highlight-fix

rose documentation: fix syntax highlighting for incorrect ignore use
Merge branch 'master' into gh-pages
Merge branch 'gh-pages' of github.com:metomi/rose into gh-pages