Add spaced-repetition learning tool

[nrbgt]

Elevator Pitch

Include an in-tool flashcard/spaced-repetition authoring and reviewing tool, with pre-built decks for the included notebook sets (#18).

Motivation

After acquiring new skills and knowledge, the anki approach is effective at helping a learner retain the knowledge.

Design ideas

• [ ] Build/adapt a JSON schema for anki cards
• [ ] import/export anki decks
  • maybe https://github.com/Stvad/CrowdAnki
• [ ] build/adapt a Markdown/python syntax for creating inline cards
  • https://github.com/lukesmurray/markdown-anki-decks
• [ ] build/adapt an in-lab deck management, acquisition, and review tool
• [ ] add a post_save hook which can extract cards
• [ ] build/package decks of cards
  • [ ] jupyterlab
  • [ ] latex
  • [ ] python
  • [ ] shipped notebook collections