Remove or reduce non-identity code from the code sample

[kengaderdus]

Purpose

• Remove or reduce non-identity code from the code sample. Reduce the number of files in the code sample.

Does this introduce a breaking change?

[ ] Yes
[-] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[-] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

Use readme instructions
https://github.com/kengaderdus/ms-identity-ciam-javascript-tutorial/tree/main/1-Authentication/5-sign-in-express

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[jo-arroyo]

What does this change mean?