Move headline styles to tailwind base

app/javascript/stylesheets/base.scss

@@ -8,6 +8,14 @@
   }
 
   h1 {
-    @apply uppercase;
+    @apply text-3xl uppercase;
+  }
+
+  h2 {
+    @apply text-2xl mb-8;
+  }
+
+  h3 {
+    @apply text-xl mb-6;
   }
 }