restore YAML frontmatter

notes/css-waving-hand-emoji/index.mdx

@@ -1,10 +1,15 @@
-export const frontmatter = {
-  title: "Animated Waving Hand Emoji 👋 Using CSS",
-  date: "2019-04-17 14:20:10-0400",
-  description: "How to make the 👋 waving hand emoji actually wave using pure CSS animation!",
-  tags: ["CSS", "Animation", "Emoji", "Keyframes", "Cool Tricks"],
-  image: "codepen.png",
-};
+---
+title: "Animated Waving Hand Emoji \U0001F44B Using CSS"
+date: "2019-04-17 14:20:10-0400"
+description: "How to make the \U0001F44B waving hand emoji actually wave using pure CSS animation!"
+tags:
+  - CSS
+  - Animation
+  - Emoji
+  - Keyframes
+  - Cool Tricks
+image: ./codepen.png
+---
 
 ## Howdy, friends! 👋