feat: Add a "What is Conduit?" video (#323)

* add what is conduit video

* hide some controls

* better spacing

Author: raulb

docs/0-what-is/0-introduction.mdx

@@ -4,6 +4,7 @@ hide_title: true
 title: 'Introduction'
 sidebar_label: "Introduction"
 slug: '/'
+hide_table_of_contents: true
 ---
 
 import ThemedImage from '@site/src/components/ThemedImage';
@@ -13,9 +14,22 @@ import ThemedImage from '@site/src/components/ThemedImage';
     darkImage="/img/logos/conduit-logo-dark.svg"
     lightImage="/img/logos/conduit-logo-light.svg"
     altText="Conduit Logo"
-    className="py-5"
+    className="pt-5"
   />
 
+<div style={{ position: 'relative', paddingBottom: '56.25%', height: 0, overflow: 'hidden', maxWidth: '100%' }}>
+  <iframe
+    src="https://www.loom.com/embed/0df6511a4c9c4e3a98dc43ada9e109df?sid=dba50455-ac4e-4e3d-ba66-db88a67f653b?hideEmbedTopBar=true&hide_title=true&hide_owner=true&hide_share=true&hide_speed=true"
+    webkitallowfullscreen
+    frameborder="0"
+    mozallowfullscreen
+    allowFullScreen
+    style={{ position: 'absolute', top: 0, left: 0, width: '100%', height: '100%' }}
+  ></iframe>
+</div>
+
+<br/>
+
 Conduit is a data streaming tool for software and data engineers, powered
 by [Meroxa](https://meroxa.io). Its purpose is to help you move data from A to
 B. You can use Conduit to send data from Kafka to Postgres, between files and