Due to a bug in Rouge thats prevents it from working on MS Windows, we
are currently reverting back to CodeRay for source code highlighting
within the Reference Manual.
Issues: SPR-15471
This commit uses a tip provided by @mojavelinux to set the syntax
highlighter to Rouge for the PDF version of the User Guide.
Once Asciidoctor 1.5.7 has been released we will likely switch to Rouge
for the HTML version of the Reference Manual as well.
Issue: SPR-14997
This commit removes docbook from the documentation toolchain and
instead makes use of asciidoctor to render the reference documentation
in HTML and PDF formats.
The main Gradle build has been refactored with the documentation tasks
and sniffer tasks extracted to their own gradle file in the "gradle"
folder.
A new asciidoctor Spring theme is also used to render the HTML5 backend.
Issue: SPR-14997
Sam Brannen
Fredrik Sundberg
Brian Clozel