Switch to npm lockfile

Author: razor-x

.gitignore

@@ -24,11 +24,8 @@ examples/local.json
 # Temporary development files
 tmp
 
-# Serverless Offline
-.serverless-offline
-
-# npm lockfile (only yarn.lock supported)
-package-lock.json
+# Yarn lockfile (only package-lock.json supported)
+yarn.lock
 
 # Logs
 logs