Update portal/index.md

Author: agoose77

portal/index.md

@@ -2,7 +2,7 @@
 
 :::{banner}
 :color: rgba(26, 100, 143, 0.9)
-:image: \_static/images/backgrounds/pexels-jeff-stapleton-5792818.jpg
+:image: _static/images/backgrounds/pexels-jeff-stapleton-5792818.jpg
 :caption: Photo by Jeff Stapleton from Pexels
 :class: dark-banner
 :::