Until now, only code snippets in the manual itself would contain links
to identifier definitions. Now snippets in the cookbook also link to
definitions in the manual.
* doc/build.scm (html-manual): Add #:mono-node-indexes and #:multi-node-indexes
and pass it to 'syntax-highlighted-html'.
(pdf+html-manual): Likewise, and pass it to 'html-manual'.
<top level>: Factorize 'version' and 'source'. Define 'guix-manual',
'mono-node-indexes', and 'split-node-indexes'. Pass #:mono-node-indexes
and #:split-node-indexes to 'pdf+html-manual'.
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