allow progressive loading/templates #71
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Before rendering/server the voila.tpl (nbconvert) template, we (optionally) send an html page (voila.html template) to allow progressive loading. A template can show a spinner (example below), or already show a portion of the UI.
This new template is basically a split of voila.tpl into voila.html (the header and a loading screen), and voila.tpl (the rest of the body, and the end tags).
This solves #70 and is a subset of #60.