Documentation: enable ditaa integration

For prettier diagrams: http://ditaa.sourceforge.net/

Change-Id: Ic28dc5ea9d82ff6bf8654e2e33e675a536348654
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37646
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

Documentation/conf.py

@@ -25,6 +25,8 @@ release = subprocess.check_output(('git', 'describe')).decode("utf-8")
 # The short X.Y version.
 version = release.split("-")[0]
 
+extensions = ['sphinxcontrib.ditaa']
+
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #