* Update .vscode/settings.json
The "files.useExperimentalFileWatcher" setting was deprecated at some point. I tried to add "files.watcherExcluded" to see if this will help with the extreme CPU usage issues on macOS. Also removed the "buck" exclusions since we don't use buck anymore as far as I know. And I added node_modules exclusions because that seems like a sensible thing to exclude.
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* make it valid JSON
