Sass docs updates (#37897)

* Add maps

* Redesign scss-docs rendering

* Update other CSS sections

* Fix linter

site/content/docs/5.3/components/carousel.md

@@ -347,9 +347,9 @@ Add `.carousel-dark` to the `.carousel` for darker controls, indicators, and cap
 
 The transition duration of `.carousel-item` can be changed with the `$carousel-transition-duration` Sass variable before compiling or custom styles if you're using the compiled CSS. If multiple transitions are applied, make sure the transform transition is defined first (e.g. `transition: transform 2s ease, opacity .5s ease-out`).
 
-## Sass
+## CSS
 
-### Variables
+### Sass variables
 
 Variables for all carousels:
 

site/content/docs/5.3/components/collapse.md

@@ -100,9 +100,9 @@ If your control element is targeting a single collapsible element – i.e. the `
 
 Note that Bootstrap's current implementation does not cover the various *optional* keyboard interactions described in the [ARIA Authoring Practices Guide accordion pattern](https://www.w3.org/WAI/ARIA/apg/patterns/accordion/) - you will need to include these yourself with custom JavaScript.
 
-## Sass
+## CSS
 
-### Variables
+### Sass variables
 
 {{< scss-docs name="collapse-transition" file="scss/_variables.scss" >}}