Always use ":leveloffset: +1" with ":doctype: book"
Headlines per ADOC file should start at level 1, not 2. Adjusting the
level offset for books helps to avoid warnings when including book
chapters, but still allows to also use the chapters as stand-alone
documents.
Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>
Follow-up on previous rename-only commit. This time, the binaries are
real PNGs. The asciidoc and other references to them have also been
replaced. File figures_classes.png in the teaching materials also was
rotated by 90° to display it correctly.
Background: The Asciidoctor PDF back-end cannot handle GIFs directly
without an additional Ruby Gem. It is easier to only use PNGs and JPEGs.
Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>
The files are still GIFs for now. In the next steps after the rename,
they will be replaced by real PNGs.
Background: The Asciidoctor PDF back-end cannot handle GIFs directly
without an additional Ruby Gem. It is easier to only use PNGs and JPEGs.
Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>
Alexander Kriegisch