fix nil ref error

Signed-off-by: Vivek Vishal <vishalvivek488@gmail.com>

Author: Vivek Vishal

layouts/partials/footer.html

@@ -85,8 +85,10 @@ <h5 class="footer-h5"><a href="{{ .url }}">{{ .name }}</a></h5>
     <div class="footer-bottom-middle">
       <span>
         <span class="edit-page">
-          <a href="https://github.com/layer5io/docs/tree/master{{ strings.TrimPrefix hugo.WorkingDir .Page.File.Filename }}" target="_blank"
-            rel="noreferrer">Edit This Page </a>
+          {{ with .File }}
+          <a href="https://github.com/layer5io/docs/tree/master{{ strings.TrimPrefix hugo.WorkingDir .Filename }}" target="_blank"
+            rel="noreferrer">Edit This Page</a>
+          {{ end }}
         </span>
         <span>
           <a class="status-link" href="https://layer5.statuspage.io" target="_blank" rel="noreferrer">