1. Following up on bbinet's changes in f12a297, ensure that the notmyidea
theme's article.html template includes the SITEURL variable when
constructing URL links.
2. Add missing slash to the base.html template so that clicking on the
site header at top left refers to "/" instead of "" when SITEURL is not
defined. Otherwise, the "" target will cause the browser to load the
current page and not the site's root (as one would expect).
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