ci: Update submodule paths

subchapters/0_preamble.adoc

@@ -4,8 +4,9 @@
 :toclevels: 2
 :sectnums:
 // path to asciidoc resources
-:asciidoc-resources: ../asciidoc-resources
-//
+:asciidoc-resources: asciidoc-resources
+// relative path to images folder
+:img_dir: images
 ifdef::backend-html5[]
 :toc: left 
 :nofooter:
@@ -25,8 +26,8 @@ ifdef::backend-pdf[]
 :pdf-fontsdir: {asciidoc-resources}/fonts
 :title-logo-image: image:asam_logo.png[align=left, top=0.9cm, pdfwidth=10cm]
 :notitle:
-:front-cover-image: ../images/ASAM_OSC_Cover_front.pdf
-:back-cover-image: ../images/ASAM_OSC_Cover_back.pdf
+:front-cover-image: {img_dir}/ASAM_OSC_Cover_front.pdf
+:back-cover-image: {img_dir}/ASAM_OSC_Cover_back.pdf
 endif::[]
 :stem: latexmath
 :icons: font
@@ -39,5 +40,5 @@ endif::[]
 //embed images into html
 :data-uri: 
 :mathematical-format: svg
-:imagesdir: ../images
-:imagesoutdir: ../images/generated_images
+:imagesdir: {img_dir}
+:imagesoutdir: {img_dir}/generated_images