docs: Extracts organizations example to a dedicated markdown file

[kailash-b]

Changes

• Extracts the organisation login example section into a dedicated markdown file.

References

Testing

• This change adds unit test coverage
• This change adds integration test coverage
• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors

[rmad17]

The changes look good @kailash-b. We should also update the references/docs-update.md.

auth0-server-python/references/docs-update.md

Line 55 in 2218271

| Redirect login, callback, organizations | `examples/InteractiveLogin.md` |

It still routes organizations to examples/InteractiveLogin.md, but the content moved. The repo's own docs rule (new-feature-with-no-guide) says adding a new feature guide isn't complete until you add its row to that map. We can update that row to point at examples/OrganizationLogin.md in this PR.