figure not showing in multi-task tutorial notebook on ax.dev

[sgbaird]

This isn't a problem for me since I'm looking at a downloaded copy. Normally, I thought these would appear, so I figured I'd pass this on.

See the snippet from https://ax.dev/tutorials/multi_task.html

Same in https://ax.dev/tutorials/multiobjective_optimization.html (and probably others)

Related, but I think it's a different issue than #306

[lena-kashtelyan]

@mpolson64 and @saitcakmak are looking into addressing this; our website build script is currently not healthy and we cannot re-publish it.

[saitcakmak]

Closing as the issues with the plots have been resolved