Add highlights

Author: cwickham

docs/authoring/brand.qmd

@@ -332,6 +332,17 @@ logo:
   small: quarto-logo
 ``` 
 
+#### Light and Dark Logos {#light-and-dark-logos}
+
+Specify different logos for light and dark mode with `light` and `dark` options under `small`, `medium`, or `large`:
+
+``` {.yaml filename="_brand.yml"}
+logo:
+  medium:
+    light: logo.png
+    dark: logo-white.png
+```
+
 #### Document logo customization
 
 You can further customize the logo at the document level with the `logo` option.

docs/prerelease/1.8/_highlights.qmd

@@ -1 +1,21 @@
-We're working on this highlight document right now! Check back soon.
+Quarto 1.8 includes the following new features:
+
+-  Improvements to brand support:
+    - [Light and dark colors](/docs/authoring/brand.qmd#light-and-dark-colors): Specify `light` and `dark` for any color in a brand specification.
+    - [Light and dark logos](/docs/authoring/brand.qmd#light-and-dark-logos): Specify `light` and `dark` versions of logos in a brand specification.
+    - [Brand extensions](/docs/extensions/brand.qmd): Share brand definitions and assets across Quarto projects.
+    -  [Dark brand for `format: revealjs`](/docs/authoring/brand.qmd#brand-mode): Specify `brand-mode: dark` to apply your dark brand to your presentation.
+
+-  [HTML Accessibility Checks](/docs/output-formats/html-accessibility.qmd): Add the `axe` option to HTML formats to perform accessibility checks with the [Axe-core engine](https://github.com/dequelabs/axe-core).
+
+-  [Access execution settings from code cells](): Read the `QUARTO_EXECUTE_INFO` environment variable to access information about execution context.
+
+-  [Access metadata and variables in filters and shortcodes](): Use the new `quarto.variables.get()` and `quarto.metadata.get()` APIs.
+
+- The default LaTeX engine is now `lualatex`.
+
+Dependency updates:
+
+- `mermaidjs` updated to 11.6.0.
+- Bootstrap icons updated to v1.13.1
+- `QuartoNotebookRunner` in `julia` engine updated to 0.17.3