Update _index.md

Author: RachHG

content/en/_index.md

@@ -21,14 +21,14 @@ blocks:
     [Harmony](https://harmonydata.ac.uk/app/) - Our flagship tool that uses Large Language Models to automatically match items from different questionnaires, even across different languages.
 
 buttons:
-    text: Try Harmony Meta Now
-    url: "https://harmonydata.ac.uk/search/"
-    style: gradient
-    size: large
-    text: Harmonise your questionnaires
-    url: "https://harmonydata.ac.uk/app/"
-    style: gradient
-    size: large
+- text: Try Harmony Meta Now
+  url: "https://harmonydata.ac.uk/search/"
+  style: gradient
+  size: large
+- text: Harmonise your questionnaires
+  url: "https://harmonydata.ac.uk/app/"
+  style: gradient
+  size: large
 
   links:
   - heading: Harmony Meta