* Adding last updated time for docs
* Making file path general and other suggested changes
* Checking if time returned is null due to absence of git or some other issue
* Adding option to enable/disable update time feature and test-doc
* Adding simple unit tests for getGitUpdateTime()
* nits & rewrote failing test
* consistent test naming
* Adding optional updateEnableTime in documentation
* package-lock & yarn.lock
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