docs: update docs and footnote styles

assets/css/typography.css

@@ -83,6 +83,9 @@
       @apply text-sm text-gray-500 dark:text-gray-400 mt-2 block text-center;
     }
   }
+  .footnotes {
+    @apply mt-12 text-sm;
+  }
 }
 
 .subheading-anchor {