Documentation: Remove ditaa support

Ditaa is a utility to convert ascii block diagrams into bitmap graphics.
The latest sphinx-contrib-ditaa extension has not been updated since
2022 [1] and does not declare whether it is safe for parallel reading,
causing sphinx to issue a warning as we use the `-j auto` flag to
parallelize the build. It doesn't seem like anyone ever used it in the
docs aside from a now abandoned patch [2], so just remove it.

[1] https://pypi.org/project/sphinxcontrib-ditaa/
[2] https://review.coreboot.org/c/coreboot/+/37643

Change-Id: I460ce24aab203cbb416888787fc6e2c613d306b3
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84887
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions