Bug 1817600 - Add NordVPN sponsorship details. r=IanN r=frg

lib/wrapper.tmpl

@@ -60,6 +60,11 @@
     <div id="content">
       <div id="side">
         [% INCLUDE $sidebar %]
+        <div id="partnerships">
+          <a href="https://go.nordvpn.net/aff_c?offer_id=15&aff_id=81347&url_id=902" target="_blank">
+            <img src="/images/template/nordvpn-banner.png" />
+          </a>
+        </div>
       </div>
       <div id="mainContent">
         [% IF document.links.next || document.links.prev || document.links.toc -%]

src/css/base/content.css

@@ -192,6 +192,12 @@ a.cont {
   text-align: right;
 }
 
+#side img {
+  max-width: 100%;
+  display: block;
+  margin: auto;
+}
+
 /* Quotations */
 
 blockquote > address {