Quadrant: One-Sided Axes

An axis with one label is drawn from the plot corner; a trailing `-->` keeps its arrow in the label.

quadrant-one-sided-axes.mmd
quadrantChart
    x-axis Effort -->
    y-axis Impact
    quadrant-1 Big bets
    quadrant-3 Fill-ins
    Refactor: [0.8, 0.4]
    Docs: [0.2, 0.3]
Output
Quadrant chart, Zombie Mermaid Big bets Fill-ins Docs Refactor Effort ⟶ Impact

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