Use image preview instead of contextual help

Author: cwickham

docs/tools/_examples/500px-Celestial_spiral_with_a_twist.jpg

@@ -24,4 +24,9 @@ ax.plot(theta, r)
 ax.set_rticks([0.5, 1, 1.5, 2])
 ax.grid(True)
 plt.show()
-```
+```
+
+![](500px-Celestial_spiral_with_a_twist.jpg){#fig-star}
+
+Photo by ALMA (ESO/NAOJ/NRAO)/H. Kim et al. - [Original](https://www.eso.org/public/images/potw1710a/), [CC BY 4.0](https://creativecommons.org/licenses/by/4.0)
+

docs/tools/_examples/python.qmd

@@ -16,9 +16,11 @@ The [Quarto VS Code Extension](https://marketplace.visualstudio.com/items?itemNa
 -   Live preview for LaTeX math as well as Mermaid and Graphviz diagrams
 
 The Quarto extension integrates directly with Positron's native R and Python features.
-For example, here the Quarto extension runs a Python cell in the active Python Console and shows contextual help for Python functions.
+For example, here the Quarto extension runs a Python cell in the active Python Console and shows a preview of an included image.
 
-![](/docs/tools/images/positron-python.png){.border .preview-image fig-alt="Screen shot of Positron editor with three vertical sections. The leftmost includes the file explorer, and quarto help. The second pane is the source code for a quarto file with python code, and the active Python Console. The third shows the Environment and Plots for the active console populated with the output of the code cells."}
+![](/docs/tools/images/positron-python.png){.border .preview-image .content-light fig-alt="Screen shot of Positron editor with three vertical sections. The leftmost includes the file explorer, and quarto assist pane. The second pane is the source code for a quarto file with python code, and the active Python Console. The third shows the Environment and Plots for the active console populated with the output of the code cells."}
+
+![](/docs/tools/images/positron-python-dark.png){.border .content-dark .preview-image fig-alt="Screen shot of Positron editor with three vertical sections. The leftmost includes the file explorer, and quarto assist pane. The second pane is the source code for a quarto file with python code, and the active Python Console. The third shows the Environment and Plots for the active console populated with the output of the code cells."}
 
 The Quarto extension also works well with other extensions bundled with Positron, like Jupyter extension, and those you might install separately, like the Julia extension.