Further narrow scope

Makefile

@@ -16,7 +16,7 @@ verify:
 	sudo nginx -t
 
 build: build-swagger
-	grep -rl __BASE_URL__ . | xargs sed -i 's|__BASE_URL__|${BASE_URL}|g'
+	grep -rl __BASE_URL__ ./docs | xargs sed -i 's|__BASE_URL__|${BASE_URL}|g'
 	mkdocs build
 
 build-swagger: