changed exhibitions positioning - removed from about section

layouts/partials/about.html

+{{ "<!-- About Section -->" | safeHTML }}
+<section id="about">
+  <div class="container">
+    <div class="row">
+      <div class="col-lg-12 text-center">
+        <h2 class="section-heading">{{ with .Site.Params.about.title }}{{ . | markdownify }}{{ end }}</h2>
+        <h3 class="section-subheading text-muted">{{ with .Site.Params.about.subtitle }}{{ . | markdownify }}{{ end }}</h3>
+      </div>
+    </div>
+  </div>
+</section>