Fix inheritance diagrams

[melanieclarke]

The inheritance diagrams in the deployed documentation are not displaying correctly. The diagram code displays instead of the diagram image.

This may be associated with recent changes to build and deployment to Pages.

For example:
sofia_redux.visualization.eye.Eye
shows:

digraph inheritancebb54a4d2b2 { bgcolor=transparent; rankdir=LR; size=""; "Eye" [URL="../../../api/sofia_redux.visualization.eye.Eye.html#sofia_redux.visualization.eye.Eye",fillcolor=white,fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,margin=0.25,shape=box,style="setlinewidth(0.5),filled",target="_top",tooltip="Run the Eye of SOFIA."]; }

Tested with Chrome and Safari, both show the same problem.