Refactor: Add documentation for the Scastie configuration

Author: Dedelweiss

Gemfile.lock

@@ -219,6 +219,8 @@ GEM
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.18.0)
+    nokogiri (1.14.3-x86_64-darwin)
+      racc (~> 1.4)
     nokogiri (1.14.3-x86_64-linux)
       racc (~> 1.4)
     octokit (4.25.1)
@@ -263,6 +265,7 @@ GEM
     zeitwerk (2.6.7)
 
 PLATFORMS
+  x86_64-darwin-22
   x86_64-linux
 
 DEPENDENCIES

_overviews/scala3-scaladoc/settings.md

@@ -172,6 +172,14 @@ Which means:
 - all snippets in files under directory `my/path/f` should fail during compilation
 - all other snippets should compile successfully
 
+#### -scastie-configuration
+
+Define the additional sbt configuration for your Scastie snippets. For example, when you import external libraries into your snippets, you need to add the related dependencies.
+
+```
+"-scastie-configuration", """libraryDependencies += "org.apache.commons" % "commons-lang3" % "3.12.0""""
+```
+
 ##### -Ysnippet-compiler-debug
 
 Setting this option makes snippet compiler print the snippet as it is compiled (after wrapping).