List of included changes:   - Updates links in README.   - Internal cleanup.
List of included changes:
  - Updates links in README.
  - Internal cleanup.

PiperOrigin-RevId: 396420847
Change-Id: I7d014bdaf59e45b69bd3c7bf2d69475452e34b59

googlesamples/mlkit,googlesamples/mlkit,googlesamples/mlkit,googlesamples/mlkit