We now use spring-doc-resources that contains CSS and JavaScript for our reference documentation. External doc resources requires an intermediate asciidoc sources directory to include docinfo files. Documentation generation hence now unpacks Spring Data Build resources and Spring Doc resources, generates an intermediate sources directory and compiles documentation from there.
Multi-module projects require a slight adjustment of their external (e.g. Spring Data Commons) imports as doc generation happens typically within the context of a …-distribute module.
Original pull request: #545.
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