ENH: Lazy load thebe javascript #41
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choldgraf
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Description
This lazily loads the Thebe javascript bundle when the
initThebefunction is triggered (usually, when somebody clicks the "launch Thebe" button).It does this by appending a
scriptto the page header via javascript, rather than adding it to the Sphinx HTML bundle when it is created.Rationale
In most cases, people won't need Thebe loaded on a page because they'll only have one or two pages of their docs site that have Thebe-relevant content. Rather than loading Thebe each time, this will ensure it's loaded only when actively needed. It will take a bit longer to load when people click the button, but in most cases the size of the inputs/outputs loading will likely quickly be larger than the original thebe javascript payload, so this shouldn't hurt the UX much.
Behavior changes
There's one default change with this PR:
thebewill now be loaded lazily by default, whereas before it was loaded automatically on all pages by default.closes #34
closes jupyter-book/jupyter-book#1014
closes #32