fix(efp): add api to overview

Author: ldecarvalho-doc

pages/environmental-footprint/index.mdx

@@ -32,4 +32,12 @@ This feature is currently available on a limited number of products and will soo
         label="View How-tos"
         url="/environmental-footprint/how-to/track-monthly-footprint"
     />
-</Grid>
+</Grid>
+
+<ClickableBanner
+    productLogo="cli"
+    title="Environmental Footprint API"
+    description="Find tools that help monitor your environmental footprint using Scaleway's services."
+    url="https://www.scaleway.com/en/developers/api/environmental-footprint/user-api/"
+    label="Go to Environmental Footprint API"
+/>