add tutorials

adaptive/notebook_integration.py

adaptive/runner.py

docs/.gitignore

docs/environment.yml

docs/source/conf.py

docs/source/index.rst

docs/source/reference/adaptive.rst

docs/source/reference/adaptive.runner.extras.rst

docs/source/tutorial/tutorial.AverageLearner.rst

docs/source/tutorial/tutorial.BalancingLearner.rst

docs/source/tutorial/tutorial.DataSaver.rst

docs/source/tutorial/tutorial.IntegratorLearner.rst

docs/source/tutorial/tutorial.Learner1D.rst

docs/source/tutorial/tutorial.Learner2D.rst

docs/source/tutorial/tutorial.LearnerND.rst

docs/source/tutorial/tutorial.SKOptLearner.rst

docs/source/tutorial/tutorial.advanced-topics.rst

docs/source/tutorial/tutorial.custom_loss.rst

docs/source/tutorial/tutorial.parallelism.rst

docs/source/tutorial/tutorial.rst