Update index.html

Link to the categorical model page is added.

Author: yuta-nakahara

docs/index.html

@@ -442,6 +442,7 @@ <h2>Package list<a class="headerlink" href="#package-list" title="Permalink to t
 <li><p><a class="reference internal" href="bayesml.html"><span class="doc">bayesml package</span></a></p></li>
 <li><p><a class="reference internal" href="bayesml.autoregressive.html"><span class="doc">bayesml.autoregressive package</span></a></p></li>
 <li><p><a class="reference internal" href="bayesml.bernoulli.html"><span class="doc">bayesml.bernoulli package</span></a></p></li>
+<li><p><a class="reference internal" href="bayesml.categorical.html"><span class="doc">bayesml.categorical package</span></a></p></li>
 <li><p><a class="reference internal" href="bayesml.exponential.html"><span class="doc">bayesml.exponential package</span></a></p></li>
 <li><p><a class="reference internal" href="bayesml.linearregression.html"><span class="doc">bayesml.linearregression package</span></a></p></li>
 <li><p><a class="reference internal" href="bayesml.multivariate_normal.html"><span class="doc">bayesml.multivariate_normal package</span></a></p></li>