Update menu.html

wiki/menu.html

@@ -59,6 +59,7 @@
             Wet Lab
           </a>
           <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
+            <li><a class="dropdown-item" href="{{ url_for('pages', page='proof-of-concept') }}">Pproof of concept</a></li>
             <li><a class="dropdown-item" href="{{ url_for('pages', page='parts') }}">Parts</a></li>
             <li><a class="dropdown-item" href="{{ url_for('pages', page='notebook') }}">Notebook</a></li>
             <li><a class="dropdown-item" href="{{ url_for('pages', page='protocol') }}">Protocol</a></li>