chapter-background.png is referenced in the Makefile as a dependency but does not exist in the repo

[rbarzic]

make book.printable.pdf
make: *** No rule to make target 'chapter-background.png', needed by 'book.printable.pdf'. Stop.

There are also some other errors but they may be related by my asciidoc installation (Ubuntu 16.04.1 LTS)

make book.html
mkdir -p book.html
a2x --icons -d book -D book.html -f xhtml book.txt
a2x: ERROR: missing resource: /home/roba/perso/github/asciidoc-book-toolchain/images/icons/callouts/1.png
Makefile:26: recipe for target 'book.html' failed
make: *** [book.html] Error 1

[jd]

@rbarzic Not sure what's the icon issue is though. Removing the --icons might help though.