Marketing website improvements (#3169)

* Website improvement

* Improve website design

* Start writing script for user guide

* Begin adding user guide

packages/twenty-website/src/app/components/ContentContainer.tsx

@@ -1,11 +1,18 @@
 'use client'
 
+import styled from '@emotion/styled'
+
+const Container = styled.div`
+    display: flex;
+    flex-direction: column;
+    width: 600px;
+     @media(max-width: 809px) {
+        width: 100%;
+    }`;
+
+
 export const ContentContainer = ({children}: {children?: React.ReactNode}) => {
   return (
-      <div style={{
-        width: '600px',
-        display: 'flex',
-        flexDirection: 'column',
-      }}>{children}</div>
+      <Container>{children}</Container>
   )
 }