Double babooka directories in HTML version's chapter anchor links

[jeffp42ker]

... yields broken links on the side panel navigation of https://www.braveclojure.com/quests/babooka/

<ol class="toc">
<li><a href="/quests/babooka/babooka/#Sponsor">Sponsor</a></li>
<li><a href="/quests/babooka/babooka/#What_is_Babashka_">What is Babashka?</a></li>
<li><a href="/quests/babooka/babooka/#Why_should_you_use_it_">Why should you use it?</a></li>
<li><a href="/quests/babooka/babooka/#Installation">Installation</a></li>
...
<li><a href="/quests/babooka/babooka/#Summary">Summary</a></li>
</ol>

[jonoflayham]

And in the HTML head section too: <meta path="/quests/babooka/babooka/">