Add lockfile to git

Author: alexslavr

.gitignore

@@ -1,4 +1,3 @@
-package-lock.json
 node_modules/
 artifacts/
 link-transformer-resolved-links.md
@@ -9,4 +8,4 @@ JS-Howto.xml
 JS-ApiReference-Compact.json
 JS-Howto-Compact.json
 .DS_Store
-.vscode
+.vscode