[HOS-722] ai builder intro video (#1386)

* ai builder intro video

* remove raw vid - replace with YT

Author: LineIndent

docs/ai_builder/overview/what_is_reflex_build.md

@@ -1,5 +1,18 @@
 # What Is Reflex Build
 
+<div class="p-1 my-4 rounded-lg bg-slate-5">
+  <iframe
+    width="100%"
+    height="400"
+    src="https://www.youtube.com/embed/s-kr8v7827g "
+    title="Reflex Build"
+    frameborder="0"
+    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+    allowfullscreen>
+  </iframe>
+</div>
+
+
 Reflex Build is an AI-powered platform that empowers users of all skill levels to create full-stack web applications
 without writing any code—just by describing their ideas in plain English. Instead of hiring developers, users can
 instantly generate web apps or websites, turning ideas into functional apps as quickly as possible.