Introduce Hugo shortcode to display authors table

themes/exectos/layouts/shortcodes/authors.html

@@ -0,0 +1,23 @@
+<table>
+  <thead>
+    <tr>
+      <th>Nickname</th>
+      <th>Name</th>
+      <th>Role</th>
+    </tr>
+  </thead>
+  <tbody>
+    {{ range .Site.Data.authors }}
+    <tr>
+      <td class="nick-cell">
+        <img src="https://www.gravatar.com/avatar/{{ .mail | md5 }}?s=50&d=identicon" class="avatar" />
+        <a href="https://git.codingworkshop.eu.org/xt-sys/exectos/commits/branch/master/search?q=author%3A{{ .nick }}">
+          <span>{{ .nick }}</span>
+        </a>
+      </td>
+      <td>{{ .name }}</td>
+      <td>{{ .role }}</td>
+    </tr>
+    {{ end }}
+  </tbody>
+</table>