perf(shared): move `mergeDocConfig` to node utils

[chenjiahan]

Summary

mergeDocConfig is only used by Node.js code, so it can be moved from shared/src/runtime-utils to shared/src/node-utils. This can reduce runtime code and remove lodash methods.

This PR also removed some unused bin from files field.

• before (464kB):

• after (453kB):

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

[netlify[bot]]

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