🐛 Fix alluvial node min. height in derived nodes

[joao-m-santos]

📝 Description

• Added minimum height logic to the nodes deriving color from incoming links

💥 Is this a breaking change (Yes/No):

• [x] No
• [ ] Yes (please describe the impact and migration path for existing Lume users)

📝 Additional Information

• Works by dividing the number of incoming links by the min. node height

Before submitting the PR, please make sure you do the following

• [x] Read the Contributing Guidelines.
• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• [x] Ideally, include relevant tests that fail without this PR but pass with it.

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