Unable to build trpl2 278f4db5

[kopp]

The latest version of master of trpl (278f4db5489fe0ca791f4f93b2fca858ae9cdc90) does not build with the following error:

Error: Error rendering html: trpl/second-edition/src/ch20-00-final-project-a-web-server.md: Could not find file 'trpl/second-edition/src/img/img/trpl20-01.png' for image

The complete error output is in this gist.

The version from the submodule checked in here, 90bc937c05c5fd53dcf91715a0fb3a06dd8366e5, does work fine, though. It looks like they changed

-![hello from rust](hello.png)
+![hello from rust](img/trpl20-01.png)

removing the img/ makes crowbook work again.
I'm not sure, whether the error lies with crowbook or the original book sources (which are unit tested, though, and seem to pass those...). Could you please investigate that?