* 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
Add a description of how to enable LaTeX input mode when editing the
DAML-LF spec in VS Code. Also add some additional symbols.
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