added cactus theme files

hugo-content/themes/cactus/layouts/partials/page_nav_mobile.html

@@ -0,0 +1,38 @@
+<div id="footer-post-container">
+  <div id="footer-post">
+
+    <div id="nav-footer" style="display: none">
+      <ul>
+        {{ range .Site.Menus.main }} 
+          <li><a href="{{ .URL }}">{{ .Name }}</a></li>
+        {{ end }}
+      </ul>
+    </div>
+
+    {{ if not .Site.Params.tocInline }}
+    <div id="toc-footer" style="display: none">
+      {{ .TableOfContents }}
+    </div>
+    {{ end }}
+
+    <div id="share-footer" style="display: none">
+      {{ .Scratch.Set "icon_class_name" "fa-lg" }}
+      {{ partial "share.html" . }}
+    </div>
+
+    <div id="actions-footer">
+      <!-- TODO: rewrite the toggle function. hide the others when one menu is displayed -->
+        <a id="menu-toggle" class="icon" href="#" onclick="$('#nav-footer').toggle();return false;" aria-label="Menu">
+          <i class="fas fa-bars fa-lg" aria-hidden="true"></i> Menu</a>
+        {{ if not .Site.Params.tocInline }}
+        <a id="toc-toggle" class="icon" href="#" onclick="$('#toc-footer').toggle();return false;" aria-label="TOC">
+          <i class="fas fa-list fa-lg" aria-hidden="true"></i> TOC</a>
+        {{ end }}
+        <a id="share-toggle" class="icon" href="#" onclick="$('#share-footer').toggle();return false;" aria-label="Share">
+          <i class="fas fa-share-alt fa-lg" aria-hidden="true"></i> share</a>
+        <a id="top" style="display:none" class="icon" href="#" onclick="$('html, body').animate({ scrollTop: 0 }, 'fast');" aria-label="Top of Page">
+          <i class="fas fa-chevron-up fa-lg" aria-hidden="true"></i> Top</a>
+    </div>
+
+  </div>
+</div>