add anchor links for headlines

src/sass/_base.scss

@@ -30,8 +30,12 @@ h1,
 h2,
 h3,
 h4,
-h5 {
+h5,
+h6 {
   font-weight: $body-font-weight;
+  display: flex;
+  align-items: center;
+  text-align: center;
 }
 
 a {
@@ -217,6 +221,10 @@ img {
       content: "\1f82a";
     }
   }
+
+  &__anchor .icon {
+    color: $gray-400;
+  }
 }
 
 .gdoc-post {

src/sass/_shortcodes.scss

@@ -70,6 +70,10 @@
     min-width: $body-min-width * 0.66;
     padding: 0 $padding-16;
   }
+
+  .gdoc-page__anchor {
+    display: none;
+  }
 }
 
 // {{< button >}}