[doc] Enhance dataset visualization and documentation

docs/plot_dataset/__init__.py

@@ -0,0 +1,13 @@
+"""Plot generation utilities for EEGDash documentation."""
+
+from .bubble import generate_dataset_bubble  # noqa: F401
+from .colours import (  # noqa: F401
+    CANONICAL_MAP,
+    COLUMN_COLOR_MAPS,
+    MODALITY_COLOR_MAP,
+    PATHOLOGY_COLOR_MAP,
+    TYPE_COLOR_MAP,
+    hex_to_rgba,
+)
+from .plot_sankey import generate_dataset_sankey  # noqa: F401
+from .ridgeline import generate_modality_ridgeline  # noqa: F401