Configurable iframe height for Sphinx Gallery Interactive Scene

[bjlittle]

📰 Custom Issue

Push a change to pyvista to extend the pyvista.ext.viewer_directive (OfflineViewerDirective) sphinx extension such that it allows the height of the inline frame (iframe) to be configured within a conf.py.

At the moment this is hardwired to height='400px'.

[github-actions]

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