feat(ui): add footer with links to docs and discussions

app/assets/images/icon.svg

@@ -0,0 +1,9 @@
+<svg width="180px" height="204px" viewBox="0 0 180 204" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Postal---Solo-Avatar" transform="translate(0.950000, 0.940000)" fill="#999999" fill-rule="nonzero">
+            <polygon id="Path" points="52.89 202.12 29.89 177.1 29.89 26.8 0 26.8 18.24 118.45 0 202.12"></polygon>
+            <path d="M118.87,0 L34.97,0 L34.97,175.32 L94.05,175.32 L94.05,118.45 L118.84,118.45 C151.551826,118.45 178.07,91.9318257 178.07,59.22 L178.07,59.22 C178.064484,26.5237913 151.566205,0.0165601674 118.87,0 L118.87,0 Z" id="Path"></path>
+            <polygon id="Path" points="39.18 179.89 59.62 202.12 59.62 179.89"></polygon>
+        </g>
+    </g>
+</svg>

app/assets/stylesheets/application/components/_footer.scss

@@ -0,0 +1,25 @@
+.footer__links {
+  display:flex;
+  margin-left:auto;
+  align-items: center;
+  font-size:13px;
+  color:#999;
+  li {
+    height:24px;
+
+  }
+  li + li {
+    margin-left:18px;
+  }
+  a {
+    text-decoration: underline;
+  }
+}
+
+.footer__name {
+  height:16px;
+  background:image-url('icon.svg') no-repeat 0 0;
+  background-size:16px;
+  padding-left:22px;
+  font-weight:bold;
+}

app/assets/stylesheets/application/components/_site_content.scss

@@ -12,3 +12,10 @@
   overflow-y:scroll;
   overflow-x:hidden;
 }
+
+.siteContent__footer {
+  border-top:1px solid #efefef;
+  margin-top:20px;
+  padding:25px;
+  display:flex;
+}