Move the content under optaplanner-docs/src/main/asciidoc to optaplanner-docs/src/main/modules and split documents and images into separate folders. The resulting directory structure should look like as follows:

modules
|__ROOT
     |__images
     |    |__BenchmarkingAndTweaking/*.png
     |    |__ ...
     |__pages
          |__BenchmarkingAndTweaking/*.adoc

This structure also requires updating links to images and documents, e.g.:
image::BenchmarkingAndTweaking/benchmarkOverview.png
xref::ConstraintStreams/ConstraintStreams-chapter.adoc#constraintStreams[Constraint Streams]

Make sure all links to images and documents still work (the tooling won't fail fast if they don't).