Fix missing Netlify configuration

netlify.toml

@@ -1,6 +1,9 @@
 [build]
   publish = "demo/public"
-  command = "make prepare && hugo --source demo"
+  command = "make prepare && hugo --source demo --baseURL $URL"
+
+[context.production.environment]
+  HUGO_VERSION = "0.49"
 
 [context.deploy-preview]
   command = "make prepare && hugo --source demo --buildFuture --buildDrafts --baseURL $DEPLOY_PRIME_URL"