feat: support 2-layered scatter plot

example/scatter/example_scatter_2_layer.py

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+import matplotlib.pyplot as plt
+import seaborn as sns
+
+import maidr
+
+
+penguins = sns.load_dataset("penguins")
+
+# Initialize the plot
+fig, ax = plt.subplots(figsize=(10, 6))
+
+# Prepare Scatter plot layer
+sns.scatterplot(data=penguins, x="flipper_length_mm", y="body_mass_g", s=100, ax=ax)
+
+# Prepare Line plot layer
+sns.regplot(
+    data=penguins,
+    x="flipper_length_mm",
+    y="body_mass_g",
+    scatter=False,
+    lowess=True,
+    line_kws={"color": "black"},
+    ax=ax
+)
+
+ax.set_title("Penguin Flipper Length vs Body Mass (Smoothed)", fontsize=16)
+ax.set_xlabel("Flipper Length (mm)", fontsize=14)
+ax.set_ylabel("Body Mass (g)", fontsize=14)
+
+# Create a Maidr instance
+maidr_plot = maidr.Maidr(fig)
+
+html_string = maidr_plot.render(html=True).get_html_string()
+
+with open("example_scatter_2_layered.html", "w") as f:
+    f.write(html_string)