Add pinned posts (#4217)

webapp/sass/responsive/_desktop.scss

@@ -76,6 +76,23 @@
                 }
             }
         }
+
+        &.move--left {
+            .post {
+                &.post--root,
+                &.other--root {
+                    .post__header {
+                        padding-right: 70px;
+                    }
+                }
+
+                &.post--comment {
+                    .post__header {
+                        padding-right: 70px;
+                    }
+                }
+            }
+        }
     }
 }