Ploomber

* Adds support for using `grid` and task-level hooks in spec API

* Allow serialization of a subset of params ([338](https://github.com/ploomber/ploomber/issues/338))
* NotebookRunner `static_analysis` turned on by default
* NotebookRunner `static_analysis` ignores IPython magics
* Improved error message when NotebookRunner `static_analysis` fails
* Support for collections in `env.yaml`
* Adds `unpack` argument to `serializer`/`unserializer` decorators to allow a variable number of outputs
* General CSS documentation improvements
* Mobile-friendly docs
* Add table explaining each documentation section
* Adds hooks, serialization, debugging, logging, and parametrization cookbook
* Adds FAQ on tasks with a variable number of outputs
* Auto-documenting methods/attributes for classes in the Python API section
* Documents `io` module

* Refactors scripts/notebooks `static_analysis` feature
* Shows warning if using default value in scripts/notebooks `static_analysis` parameter
* Better error message when `DAG` has duplicated task names
* Adds more info to the files generated by ploomber scaffold
* Better error when trying to initialize a task from a path with an unknown extension

* Support for dag-level hooks in Spec API
* Better error message when invalid extension in `NotebookRunner` product
* Fixes an error when loading nested templates on Windows

* Task hooks (e.g., `on_finish`) accept custom args

* Fixes look up of conda root when running `ploomber install` when conda binary is inside the `Library` directory (Windows)
* No longer looking up pip inside conda when running `ploomber install` and `setup.py` does not exist
* Adds `--use-lock/-l` option to `ploomber install` to install using lock files