Update dead links in React CIAM tutorial

[shmup]

https://github.com/Azure-Samples/ms-identity-ciam-javascript-tutorial/blob/main/1-Authentication/1-sign-in-react/README.md#create-user-flows (which links this dead tutorial)

Sort of pivotal links to this tutorial's usefulness could be updated

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)