[MAINT] change m2r to m2r2

[jdkent]

Closes #795 .

Changes proposed in this pull request:

Summary by Sourcery

Enhancements:

• Replace m2r with m2r2 in the documentation dependencies to address compatibility issues.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the documentation dependencies by replacing the m2r package with m2r2 and removing the version constraint on mistune. This is a maintenance change that helps keep the documentation build system up to date.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Update documentation dependencies to use m2r2 instead of m2r	Replace m2r with m2r2 in doc dependencies Remove version constraint on mistune package Remove temporary workaround comment for mistune version	setup.cfg

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#795	Replace m2r package with a maintained alternative (either m2r2 or sphinx-mdinclude)	✅
#795	Remove dependency constraint on mistune<2	✅

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[sourcery-ai]

Hey @jdkent - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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