adding course intro in playlist + embedded video

Author: simonswiss

src/pages/tailwindcss-up-and-running-on-youtube/index.mdx

@@ -23,7 +23,7 @@ It also adresses common concerns for newcomers by diving into key topics: removi
 <div className="relative pb-9/16">
   <iframe
     className="absolute inset-0 h-full w-full"
-    src="https://www.youtube.com/embed/qYgogv4R8zg"
+    src="https://www.youtube.com/embed/elgqxmdVms8"
     frameBorder="0"
     allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
     allowFullScreen
@@ -32,6 +32,7 @@ It also adresses common concerns for newcomers by diving into key topics: removi
 
 ["Up and Running with Tailwind CSS"](#) is a series of 8 videos that cover everything you need to know to get your start with Tailwind CSS. Here are the topics:
 
+- [Course Intro](https://www.youtube.com/watch?v=elgqxmdVms8)
 - [Setting Up Tailwind CSS](https://www.youtube.com/watch?v=qYgogv4R8zg)
 - [The Utility-First Workflow](https://www.youtube.com/watch?v=UvF56fPGVt4)
 - [Responsive Design](https://www.youtube.com/watch?v=hX1zUdj4Dw4)