Integrate Carbon Ads

Preview: https://d.pr/i/i5FCc9

_includes/css/buysellads.css

@@ -0,0 +1,47 @@
+#carbonads {
+  display: block;
+  overflow: hidden;
+  margin: 40px auto;
+  padding: 1em;
+  max-width: 360px;
+  background-color: hsl(131, 22%, 85%);
+  font-size: 14px;
+  line-height: 1.5;
+}
+
+#carbonads a {
+  text-decoration: none;
+}
+
+#carbonads span {
+  position: relative;
+  display: block;
+  overflow: hidden;
+}
+
+.carbon-img {
+  float: left;
+  margin-right: 1em;
+}
+
+.carbon-img img {
+  display: block;
+}
+
+.carbon-text {
+  display: block;
+  float: left;
+  max-width: calc(100% - 130px - 1em);
+  text-align: left;
+}
+
+.carbon-poweredby {
+  position: absolute;
+  bottom: 0;
+  left: 144px;
+  display: block;
+  text-transform: uppercase;
+  letter-spacing: 1px;
+  font-size: 9px;
+  line-height: 1;
+}

_posts/2000-01-01-intro.md

@@ -35,6 +35,8 @@ and [latest documentation](http://javadoc.io/page/org.mockito/mockito-core/lates
 Older 1.x releases are available in [Central Repository](http://search.maven.org/#artifactdetails%7Corg.mockito%7Cmockito-core%7C1.10.19%7C)
 , [Bintray](https://bintray.com/mockito/maven/mockito/1.10.19/view) and [javadoc.io](http://www.javadoc.io/doc/org.mockito/mockito-core/1.10.19) (documentation).
 
+<script async type="text/javascript" src="//cdn.carbonads.com/carbon.js?zoneid=1673&serve=C6AILKT&placement=mockitoorg" id="_carbonads_js"></script>
+
 ### Project status updates
 
 Updates are announced via [Twitter](https://twitter.com/mockitojava) <img alt="Twitter logo" src="https://g.twimg.com/dev/img/marketing/twitter-for-websites/header-logo.png" width="21" height="21"> and [mailing list] <img alt="Google Groups" src="https://groups.google.com/forum/favicon.ico" width="21" height="21">.

combo.css

@@ -4,3 +4,4 @@
 {% include css/skeleton.css %}
 {% include css/main.css %}
 {% include css/pygments.native.css %}
+{% include css/buysellads.css %}