Search is not getting correct url root

[davidism]

Search on the newly rendered docs is causing a 404/infinite redirect error. This happens on both RTD and locally, it doesn't appear to be an issue with RTD. It seems that {{ url_root }} is empty for some reason, at this line:

pallets-sphinx-themes/src/pallets_sphinx_themes/themes/pocoo/layout.html

Line 12 in 50414a1

<script>DOCUMENTATION_OPTIONS.URL_ROOT = '{{ url_root }}';</script>

[davidism]

We can revert #3, as Sphinx is handling dirhtml search correctly now and is no longer providing the variable we used to apply the workaround, so we're breaking search now.

Not sure when Sphinx fixed search, but they removed the variable in sphinx-doc/sphinx#8732.