chore: stop tracking doc/E2E_TESTING_PLAN.md, keep local only

Made-with: Cursor

Author: deepu-mungamuri94

.gitignore

@@ -47,6 +47,9 @@ node_modules
 # local NUT credentials
 .env
 
+# local planning doc (not for repo)
+doc/E2E_TESTING_PLAN.md
+
 # os specific files
 .DS_Store
 .idea