PyGMT figures are not being showed in the latest docs about harmonica HOT 3 CLOSED

I was adding a hidden cell that sets this globally for each page. But this deserves a fix in PyGMT.

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Ah yes, I recently came across this and forgot to fix it here. The problem is that PyGMT tries to guess if we're in a notebook and sets the display of images only if it things we're in one. But since we set the external display to off when running the gallery, it turned off all displays. This is the offending line https://github.com/GenericMappingTools/pygmt/blob/main/pygmt/figure.py#L47

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Thanks for pointing to that line @leouieda. I've created a patch for this by explicitly setting method="notebook" in the user guide (#474). But maybe we can set this through a env var? Or maybe this deserves opening an issue in PyGMT adding an envvar to control this.

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