ENH: Migrate to use mystmd and quantecon-theme.

[mmcky]

This PR sets up the project to use the latest mystmd and quantecon theme.

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[kp992]

Hi @mmcky , I have updated the lectures and added some final touch ups. Removed the following lectures which don't work:

• business_cycle
• inequality
• prob-dist
• heavy-tails
• commod-price
• lp-intro
• short_path
• input-output

Also, there are few known theme specific errors which we can work on gradually while we move all the lecture series to mystmd theme.

[kp992]

One of the examples of cross reference failures is in https://68ef1da543d00816def83173--beautiful-dodol-cb9543.netlify.app/long-run-growth/. Ref name gdp1 and gdp2.

Coming from:

---
mystnb:
  figure:
    caption: GDP in the early industrialization era
    name: gdp1
---

[mmcky]

@kp992 we can actually solve this by updating the syntax to be compatible with the new mystnb system. I think the way it works is you generate a figure in code with a label and then use a figure directive to reference that label to fetch the object. That kind of makes sense to me -- rather than duplicate figure handling logic.

https://mystmd.org/guide/reuse-jupyter-outputs#outputs-as-figures

[kp992]

Thanks @mmcky, I will look into it and update the lectures

[mmcky]

thanks @kp992 are you happy for me to merge this?

[Copilot]

Pull Request Overview

This PR migrates the project from Jupyter Book to MyST Markdown (mystmd) with the quantecon-theme, representing a significant infrastructure change in the documentation build system.

Key Changes:

• Migration from Jupyter Book/TeachBooks to MyST Markdown build system
• Conversion of figure references from Jupyter Book syntax to MyST syntax
• Replacement of solution/exercise directive syntax to match MyST format
• Update of CI/CD workflow to use mystmd CLI instead of TeachBooks

Reviewed Changes

Copilot reviewed 46 out of 120 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
update_lectures.py	Adds preprocessing logic for converting solution/exercise directives and changes output directory
lectures/myst.yml	New MyST configuration file defining project metadata, table of contents, and theme
book/*.md (multiple)	Convert figure syntax from Jupyter Book to MyST format with :label: and :::{figure} blocks
book/*.md (multiple)	Replace {solution-start}/{solution-end} and {exercise-start}/{exercise-end} with {solution} directives
book/_toc.yml	Removed Jupyter Book table of contents configuration
book/_config.yml	Removed Jupyter Book configuration file
.github/workflows/ci_pr.yml	Updated CI workflow to use MyST Markdown CLI for building

Comments suppressed due to low confidence (2)

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[kp992]

Sure @mmcky. It looks good to go

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