(core) Add initial tutorials implementation

Summary:
Documents can now be flagged as tutorials, which causes them to display
Markdown-formatted slides from a special GristDocTutorial table. Tutorial
documents are forked on open, and remember the last slide a user was on.
They can be restarted too, which prepares a new fork of the tutorial.

Test Plan: Browser tests.

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D3813
This commit is contained in:
George Gevoian
2023-03-22 09:48:50 -04:00
parent 210aa92eed
commit be8e13df64
31 changed files with 1621 additions and 174 deletions

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