Docs v5: Fix Sass rounding precision and state Sass implementation (#32512)

* Add Sass section to Getting Started > Build Tools, mention Sass implementation used, mention current precision of 10 due to Dart Sass, and mention recommended minimum precision (value of 6 used in BS v4). Remove outdated Sass precision from Customize > Sass docs page.

* Remove more mentions of deprecated Sass implementations. Add links to Sass compiler mentions so we can keep all pertinent Sass compiler information in just one location instead of spread through the docs, which makes it hard to find the details and/or keep them up-to-date.

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

3 files changed, 10 insertions, 4 deletions

diff --git a/site/content/docs/5.0/customize/sass.md b/site/content/docs/5.0/customize/sass.md
index 46b8225250..d21dff7aa5 100644
--- a/site/content/docs/5.0/customize/sass.md
+++ b/site/content/docs/5.0/customize/sass.md
@@ -6,7 +6,7 @@ group: customize
 toc: true
 ---
 
-Utilize our source Sass files to take advantage of variables, maps, mixins, and more. In our build we've increased the Sass rounding precision to 6 (by default it's 5) to prevent issues with browser rounding.
+Utilize our source Sass files to take advantage of variables, maps, mixins, and more.
 
 ## File structure
 
diff --git a/site/content/docs/5.0/getting-started/build-tools.md b/site/content/docs/5.0/getting-started/build-tools.md
index 46ad928d45..fcee8cc260 100644
--- a/site/content/docs/5.0/getting-started/build-tools.md
+++ b/site/content/docs/5.0/getting-started/build-tools.md
@@ -65,6 +65,12 @@ Our [package.json]({{< param repo >}}/blob/v{{< param current_version >}}/packag
   </tbody>
 </table>
 
+## Sass
+
+Bootstrap uses [Dart Sass](https://sass-lang.com/dart-sass) for compiling our Sass source files into CSS files (included in our build process), and we recommend you do the same if you're compiling Sass using your own asset pipeline. We previously used Node Sass for Bootstrap v4, but LibSass and packages built on top of it, including Node Sass, are now [deprecated](https://sass-lang.com/blog/libsass-is-deprecated).
+
+Dart Sass uses a rounding precision of 10 and for efficiency reasons does not allow adjustment of this value. We don't lower this precision during further processing of our generated CSS, such as during minification, but if you chose to do so we recommend maintaining a precision of at least 6 to prevent issues with browser rounding.
+
 ## Autoprefixer
 
 Bootstrap uses [Autoprefixer][autoprefixer] (included in our build process) to automatically add vendor prefixes to some CSS properties at build time. Doing so saves us time and code by allowing us to write key parts of our CSS a single time while eliminating the need for vendor mixins like those found in v3.
diff --git a/site/content/docs/5.0/getting-started/download.md b/site/content/docs/5.0/getting-started/download.md
index e053eac393..af2d5a5def 100644
--- a/site/content/docs/5.0/getting-started/download.md
+++ b/site/content/docs/5.0/getting-started/download.md
@@ -21,10 +21,10 @@ This doesn't include documentation, source files, or any optional JavaScript dep
 
 Compile Bootstrap with your own asset pipeline by downloading our source Sass, JavaScript, and documentation files. This option requires some additional tooling:
 
-- Sass compiler (Libsass or Ruby Sass is supported) for compiling your CSS.
+- [Sass compiler]({{< docsref "/getting-started/build-tools#sass" >}}) for compiling Sass source files into CSS files
 - [Autoprefixer](https://github.com/postcss/autoprefixer) for CSS vendor prefixing
 
-Should you require [build tools]({{< docsref "/getting-started/build-tools#tooling-setup" >}}), they are included for developing Bootstrap and its docs, but they're likely unsuitable for your own purposes.
+Should you require our full set of [build tools]({{< docsref "/getting-started/build-tools#tooling-setup" >}}), they are included for developing Bootstrap and its docs, but they're likely unsuitable for your own purposes.
 
 <a href="{{< param "download.source" >}}" class="btn btn-bd-primary" onclick="ga('send', 'event', 'Getting started', 'Download', 'Download source');">Download source</a>
 
@@ -52,7 +52,7 @@ If you're using our compiled JavaScript and prefer to include Popper separately,
 
 ## Package managers
 
-Pull in Bootstrap's **source files** into nearly any project with some of the most popular package managers. No matter the package manager, Bootstrap will **require a Sass compiler and [Autoprefixer](https://github.com/postcss/autoprefixer)** for a setup that matches our official compiled versions.
+Pull in Bootstrap's **source files** into nearly any project with some of the most popular package managers. No matter the package manager, Bootstrap will **require a [Sass compiler]({{< docsref "/getting-started/build-tools#sass" >}}) and [Autoprefixer](https://github.com/postcss/autoprefixer)** for a setup that matches our official compiled versions.
 
 ### npm