docs: Delete nodejs-upgrade-functions sample app

[carvantes]

Description of changes:
delete the nodejs-upgrade-functions example app
This app is very outdated and is not a good example of how a SAM app should be structured

Checklist:

• Write/update tests N/A
• make pr passes
• Update documentation N/A

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #886 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #886   +/-   ##
========================================
  Coverage    94.62%   94.62%           
========================================
  Files           69       69           
  Lines         2997     2997           
  Branches       554      554           
========================================
  Hits          2836     2836           
  Misses          85       85           
  Partials        76       76

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