Pretty-jupyter

- Improved design for small screens.

- Fixed pretty-jupyter quickstart
- Improved docs

- Added other themes and required.js directly to the report.
- Fixed an issue with weird characters ruining tabset and toc (characters like parentheses, braces, square brackets, , “, ‘, etc)
- Fixed an issue where empty jinja markdown cell would lead to an error when running pretty jupyter
- Added code_tools to html output options to provide an option to enable / disable code tools. Default value is false.
- Implemented cell and notebook-level metadata.
- Changed design, added the old one to pj-legacy template.
- This required changing of the structure of jinja template a bit.
- Updated documentation, added section for metadata, modified existing bits.
- Allowed to specify classes for any Markdown / HTML element.
- Changed tokens convention (tabset -> .tabset). It is still backwards compatible though.
- Implemented script that creates basic ipynb document with Pretty Jupyter basic elements (title,…).
- Switched from setup.py to setup.cfg and pyproject.toml.
- Added detailed selenium tests for notebooks generating.

- Fixed an issue with weird characters ruining tabset and toc (characters like parentheses, braces, square brackets, , ", ', etc)
- Fixed an issue where empty jinja markdown cell would lead to an error when running pretty jupyter
- Added ``code_tools`` to html output options to provide an option to enable / disable code tools. Default value is false.

Prerelease. New features:

- Notebook and cell-level metadata specification.
- Notebook-level metadata overriding.
- Metadata validation by schema.
- New fields in metadata, such as author and date (now printed to html report). Many others.
- Helpers for using matplotlib with jinja.
- Basic pdf export support: Either via html (full support here) or pdf (partial support).

- Added themes, added examples.
- Reworked documentation, created a new doc website: https://pretty-jupyter.readthedocs.io/.