docs: bump landing page version to v0.12.1

Author: ateeples

docs/index.html

@@ -211,7 +211,7 @@
       <span class="copied" id="copied">copied</span>
       <span class="prompt">$</span> pip install agentsesh
     </div>
-    <p class="meta">v0.12.0 &middot; Python 3.10+ &middot; zero dependencies &middot; <a href="https://github.com/ateeples/agentsesh">GitHub</a> &middot; <a href="https://pypi.org/project/agentsesh/">PyPI</a></p>
+    <p class="meta">v0.12.1 &middot; Python 3.10+ &middot; zero dependencies &middot; <a href="https://github.com/ateeples/agentsesh">GitHub</a> &middot; <a href="https://pypi.org/project/agentsesh/">PyPI</a></p>
 
     <div class="stats">
       <strong>The Partnership</strong> (43% ship rate) vs <strong>The Spec Dump</strong> (7%).<br>