Use nbconvert's preprocessor framework #650
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As noted in #341 (comment), nbsphinx directly uses the nbconvert execute preprocessor before the preprocessor queue is invoked. This changes the logic to use the nbconvert preprocessor queue. It also enables the user to give a configuration for preprocessors (for example, I used this to remove cells with certain tags).
The first commit in this PR appears to work just fine. However, with the second commit applied, building the ipywidgets docs with nbsphinx ends with some errors about files (notebooks) not found in the html-collect-pages step. Unfortunately, I ran out of time to debug this, but am opening a draft PR with my current in-progress work in hopes it will be of use.
This begins to address comments from #285, #305, #341.