Update description and banner

Also remove old carousel item.
Signed-off-by: Matt Spencer <matt.spencer@arm.com>

content/blog/2022/autonomous_race_car/index.md

 ---
 Title: SOAFEE Accelerates Autonomous Race Car Development
-Description: TODO
+Description: Discover how the SOAFEE SIG is collaborating with academia to accelerate autonomous race car development
 Date: 2022-05-04
 Banner:
   Active: true
   Title: SOAFEE Accelerates Autonomous Race Car Development
-  Description: TODO
-  Background: banner/banner5.jpg
+  Description: Discover how the SOAFEE SIG is collaborating with academia to accelerate autonomous race car development
+  Background: banner/banner1.jpg
 ---
 
 # SOAFEE Accelerates Autonomous Race Car Development

content/news/2022/welcome_autocore.md

@@ -5,7 +5,7 @@ Date: 2022-04-28
 Member: voting/autocore
 
 Banner:
-  Active: true
+  Active: false
   Title: AutoCore joins SOAFEE SIG
   Description: AutoCore joins the SOAFEE SIG as a voting member.
   Background: banner/banner3.jpg