Add supported CSS colors page

doc/python/supported-colors.md

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+---
+jupyter:
+  jupytext:
+    notebook_metadata_filter: all
+    text_representation:
+      extension: .md
+      format_name: markdown
+      format_version: '1.3'
+      jupytext_version: 1.17.0
+  kernelspec:
+    display_name: Python 3 (ipykernel)
+    language: python
+    name: python3
+  language_info:
+    codemirror_mode:
+      name: ipython
+      version: 3
+    file_extension: .py
+    mimetype: text/x-python
+    name: python
+    nbconvert_exporter: python
+    pygments_lexer: ipython3
+    version: 3.13.2
+  plotly:
+    description: A list of supported named CSS Colors
+    display_as: file_settings
+    language: python
+    layout: base
+    name: Supported CSS Colors
+    order: 40
+    page_type: example_index
+    permalink: python/css-colors/
+    thumbnail: thumbnail/shape.jpg
+---
+
+# Supported CSS Colors
+
+Many properties in Plotly.py for configuring colors support named CSS colors. For example, marker colors:
+
+```python
+import plotly.graph_objects as go
+
+fig = go.Figure([
+    go.Bar(
+        x=['Jan', 'Feb', 'Mar', 'Apr'],
+        y=[20, 14, 25, 16],
+        name='Primary Product',
+        # Named CSS color
+        marker_color='royalblue'
+    )
+])
+
+fig.show()
+```
+
+The following CSS colors are supported in Plotly.py when a property accepts a named CSS color:
+
+```python hide_code=true
+import plotly.graph_objects as go
+import pandas as pd
+
+supported_colors = ["aliceblue", "antiquewhite", "aqua", "aquamarine", "azure",
+            "beige", "bisque", "black", "blanchedalmond", "blue",
+            "blueviolet", "brown", "burlywood", "cadetblue",
+            "chartreuse", "chocolate", "coral", "cornflowerblue",
+            "cornsilk", "crimson", "cyan", "darkblue", "darkcyan",
+            "darkgoldenrod", "darkgray", "darkgrey", "darkgreen",
+            "darkkhaki", "darkmagenta", "darkolivegreen", "darkorange",
+            "darkorchid", "darkred", "darksalmon", "darkseagreen",
+            "darkslateblue", "darkslategray", "darkslategrey",
+            "darkturquoise", "darkviolet", "deeppink", "deepskyblue",
+            "dimgray", "dimgrey", "dodgerblue", "firebrick",
+            "floralwhite", "forestgreen", "fuchsia", "gainsboro",
+            "ghostwhite", "gold", "goldenrod", "gray", "grey", "green",
+            "greenyellow", "honeydew", "hotpink", "indianred", "indigo",
+            "ivory", "khaki", "lavender", "lavenderblush", "lawngreen",
+            "lemonchiffon", "lightblue", "lightcoral", "lightcyan",
+            "lightgoldenrodyellow", "lightgray", "lightgrey",
+            "lightgreen", "lightpink", "lightsalmon", "lightseagreen",
+            "lightskyblue", "lightslategray", "lightslategrey",
+            "lightsteelblue", "lightyellow", "lime", "limegreen",
+            "linen", "magenta", "maroon", "mediumaquamarine",
+            "mediumblue", "mediumorchid", "mediumpurple",
+            "mediumseagreen", "mediumslateblue", "mediumspringgreen",
+            "mediumturquoise", "mediumvioletred", "midnightblue",
+            "mintcream", "mistyrose", "moccasin", "navajowhite", "navy",
+            "oldlace", "olive", "olivedrab", "orange", "orangered",
+            "orchid", "palegoldenrod", "palegreen", "paleturquoise",
+            "palevioletred", "papayawhip", "peachpuff", "peru", "pink",
+            "plum", "powderblue", "purple", "red", "rosybrown",
+            "royalblue", "rebeccapurple", "saddlebrown", "salmon",
+            "sandybrown", "seagreen", "seashell", "sienna", "silver",
+            "skyblue", "slateblue", "slategray", "slategrey", "snow",
+            "springgreen", "steelblue", "tan", "teal", "thistle", "tomato",
+            "turquoise", "violet", "wheat", "white", "whitesmoke",
+            "yellow", "yellowgreen"]
+
+fig = go.Figure(layout=dict(title="Supported Named CSS Colors"))
+
+for i, color in enumerate(supported_colors):
+    row, col = i // 5, i % 5
+    x0, y0 = col * 1.2, -row * 1.2
+
+    fig.add_shape(
+        type="rect",
+        x0=x0, y0=y0,
+        x1=x0+1, y1=y0+1,
+        fillcolor=color,
+        line=dict(color="black", width=0.2),
+    )
+
+    fig.add_annotation(
+        x=x0+0.5, y=y0-0.1,
+        text=color,
+        showarrow=False,
+        font=dict(size=10)
+    )
+
+fig.update_layout(
+    height=((len(supported_colors) // 5) + (1 if len(supported_colors) % 5 else 0)) * 120,
+    width=800,
+    showlegend=False,
+    plot_bgcolor='rgba(0,0,0,0)',
+    margin=dict(l=50, r=50, t=50, b=50),
+    xaxis=dict(
+        showgrid=False,
+        zeroline=False,
+        showticklabels=False,
+        range=[-0.5, 6]
+    ),
+    yaxis=dict(
+        showgrid=False,
+        zeroline=False,
+        showticklabels=False,
+        scaleanchor="x",
+        scaleratio=1,
+        range=[-((len(supported_colors) // 5) + 1) * 1.2, 1.5]
+    )
+)
+
+fig.show()
+```