Add test long banner

Author: rly

content/_index.md

@@ -8,8 +8,9 @@ hero_section:
       btn_text: Read More
       btn_link: "https://github.com/NeurodataWithoutBorders/nwb-schema"
 banner_section:
-  enable: false
-  title: ""
+  enable: true
+  title: "**This website is under construction.** Please excuse our appearance as we work to improve the site.
+    For feedback, file an issue here: https://github.com/NeurodataWithoutBorders/neurodatawithoutborders.github.io/issues"
 card_section:
   enable: true
   cards: