fix:netlify parsing

Author: Ajay-singh1

netlify.toml

@@ -1,14 +1,11 @@
 [build]
-  publish = "public"
-  command = """
-    if [ \"$CONTEXT\" = \"production\" ]; then
-      hugo --baseURL=\"https://istio.io/\"
-    elif [ \"$CONTEXT\" = \"deploy-preview\" ]; then
-      hugo --baseURL=\"$DEPLOY_PRIME_URL/\"
-    else
-      hugo --baseURL=\"https://preliminary.istio.io/\"
-    fi
-  """
+    publish = "public"
+[context.production]
+    command="hugo --baseURL=https://istio.io/latest" 
+[context.deploy-preview]
+    command="hugo --baseURL=${DEPLOY_PRIME_URL}/"
+[context.branch-deploy]
+    command="hugo --baseURL=https://preliminary.istio.io/" 
 [build.environment]
     # Consult the Docs WG before bumping Hugo.
     # Specifically, the version here should match docker/build-tools/Dockerfile in istio/tools,