docs: add Zenodo DOI badge

[nh13]

mako is now archived on Zenodo via the GitHub integration, with its full release history backfilled.

This adds a DOI badge using 10.5281/zenodo.21446428, the concept DOI covering all versions, which always resolves to the latest release.

Verified: all four releases (v0.1.0–v0.1.3) are in a single concept series, currently resolving to v0.1.3.

Summary by CodeRabbit

• Documentation
  • Added a Zenodo DOI badge to the project README for improved publication and citation visibility.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b15ea701-2166-4ba7-a401-965fad59a5ba

📥 Commits

Reviewing files that changed from the base of the PR and between 3dd50cf and e72d4ec.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md now displays a Zenodo DOI badge in its introductory badge block.

Changes

Documentation Badge

Layer / File(s)	Summary
Add Zenodo DOI badge README.md	Adds a Zenodo badge linking to DOI 10.5281/zenodo.21446428 alongside the existing project badges.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A bunny hops past badges bright,
One DOI joins the morning light.
Zenodo shines above the page,
A tiny link upon the stage.
“Thump-thump!” the rabbit cheers with glee.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a Zenodo DOI badge to the documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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