Fix TypeScript workflow cache configuration

[ChrisTorng]

Summary

• remove the npm cache configuration from the setup-node step so the workflow no longer expects a lockfile

Testing

• not run (CI workflow change only)

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https://chatgpt.com/codex/tasks/task_e_68e6f3c728f083228e862ef6b927f570

[chatgpt-codex-connector]

💡 Codex Review

https://github.com/ChrisTorng/SongsRemix/blob/5a88ddd78200f39fc8eff15b33cc4eca321082a9/src/index.js#L1-L3
Removing compiled JS breaks static site

The change deletes index.js and songsList.js while .gitignore now ignores all src/**/*.js files, but src/index.html still references those scripts and no replacement build/deploy step was added. After this commit a fresh checkout (or the GitHub Pages site that serves files directly from the repo) no longer includes the compiled JavaScript, so the page fails to load unless contributors run npm run build locally and manually copy the results. This regression blocks normal usage of the app and the published site.

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