[Doc] drop obsolete sphinx.ext.pngmath

8 jobs for master in 1 minute and 30 seconds (queued for 1 second)
Name Stage Failure
failed
robotpkg-py-sot-application-v3-py3-stretch-release Test
ERROR:
ERROR: See /root/robotpkg/wip/py-sot-application-v3/work.runner-ke6dzkhd-project-74-concurrent-1/sysdep.log for details.
ERROR: ======================================================================
make: *** [do-depends] Error 1
/root/robotpkg/mk/depends/depends.mk:70: recipe for target 'do-depends' failed
/root/robotpkg/mk/internal/trusted.mk:36: recipe for target 'install' failed
make: *** [install] Error 2
Cleaning up file based variables
ERROR: Job failed: exit code 1