Update documentation

Author: AllenDowney

_sources/api.md

@@ -1,3 +1,3 @@
 # API Reference
 
-The complete API documentation is available [here](api/index.html). 
+The complete API documentation is available [here](api/site/index.html). 

api.html

@@ -377,7 +377,7 @@ <h1>API Reference</h1>
 
   <section class="tex2jax_ignore mathjax_ignore" id="api-reference">
 <h1>API Reference<a class="headerlink" href="#api-reference" title="Link to this heading">#</a></h1>
-<p>The complete API documentation is available <a class="reference internal" href="#api/index.html"><span class="xref myst">here</span></a>.</p>
+<p>The complete API documentation is available <a class="reference internal" href="#api/site/index.html"><span class="xref myst">here</span></a>.</p>
 </section>
 
     <script type="text/x-thebe-config">