Delete incomplete examples

open-vaccine/.gitkeep

open-vaccine/README.md

open-vaccine/open-vaccine.ipynb

open-vaccine/requirements.txt

tensorboard/.gitkeep

tensorboard/keras-tuner-nb.ipynb

tensorboard/serving_component/.gitkeep

tensorboard/serving_component/Dockerfile

...orboard/serving_component/inference_service_template.yaml

tensorboard/serving_component/krb5.conf

tensorboard/serving_component/serve_model.py

tensorboard/serving_component/serving_comp.yaml

tensorboard/training_component/Dockerfile

tensorboard/training_component/README.md

tensorboard/training_component/ml/bikes_weather_limited.py

tensorboard/training_component/ml/bw_hptune_standalone.py

tensorboard/training_component/ml/bwmodel/__init__.py

tensorboard/training_component/ml/bwmodel/model.py

tensorboard/training_component/ml/deploy_tuner.py

tensorboard/training_component/ml/eval_metrics.py