Use correct classes and images

Author: cwickham

docs/tools/images/positron-python-dark.png

@@ -18,9 +18,9 @@ The [Quarto VS Code Extension](https://open-vsx.org/extension/quarto/quarto) pro
 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 a preview of an included image.
 
-![](/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.png){.border .preview-image .light-content 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."}
+![](/docs/tools/images/positron-python-dark.png){.border .dark-content .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.