[cleanup] remove unused story shells from experiences

- //src/experiences/story_shells/mondiran

This CL removes unused story shell code and is part of a multi-repo change.

This CL needs to land before the corresponding change in topaz that removes
`//topaz/lib/story_shell` (fxr/377833)

Integration verified with:

        fx make-integration-patch

Change-Id: Id130fce7676490b5b10abf146e4c1db45938eeea
Reviewed-on: https://fuchsia-review.googlesource.com/c/experiences/+/377730
Reviewed-by: Chase Latta <chaselatta@google.com>
Commit-Queue: Jason Campbell <jasoncampbell@google.com>
48 files changed
tree: edf77cd6ec8d2e72cae8f5eaeb581517e9b05c72
  1. base_shells/
  2. benchmarks/
  3. bin/
  4. examples/
  5. lib/
  6. session_shells/
  7. settings/
  8. tests/
  9. .gitignore
  10. analysis_options.yaml
  11. AUTHORS
  12. BUILD.gn
  13. CONTRIBUTING.md
  14. LICENSE
  15. OWNERS
  16. PATENTS
  17. README.md
README.md

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