Add permalink to timestamp (#5206)

* Add permalink to timestamp

* Add permalink to timestamp

* Add permalink to timestamp

* Add permalink to timestamp

* fix error with duplicated import

* underline permalink on hover

webapp/sass/layout/_post.scss

@@ -1199,6 +1199,19 @@
         font-size: .9em;
     }
 
+    .post__permalink {
+        color: #333;
+        &:hover, &:focus {
+            color: #333;
+        }
+        &:focus {
+            text-decoration: none;
+        }
+        &:hover {
+            text-decoration: underline;
+        }
+    }
+
     .post-loading-gif {
         height: 10px;
         margin-top: 6px;

webapp/sass/responsive/_tablet.scss

@@ -366,7 +366,9 @@
                         text-rendering: auto;
                         top: -2px;
                         width: 51px;
-
+                        &:hover {
+                            text-decoration: underline;
+                        }
                     }
                 }
             }