Update backers April 2018

docs/_includes/global/side-sponsor.html

@@ -0,0 +1,16 @@
+<div class="bd-side-sponsors">
+  <p class="bd-side-sponsor-label">
+    Sponsor
+  </p>
+
+  <a class="bd-side-sponsor" href="https://tipe.io/?ref=bulma" target="_blank" rel="nofollow">
+    {%
+      include elements/responsive-image.html
+      path="sponsors/tipe"
+      extension="png"
+      alt="Tipe"
+      width="86"
+      height="50"
+    %}
+  </a>
+</div>