docs: Compiler Explorer link added to the smoot example

docs/index.md

@@ -13,6 +13,25 @@ include safety, performance, and developer experience.
 The library source code is hosted on [GitHub](https://github.com/mpusz/mp-units) with a permissive
 [MIT license](https://github.com/mpusz/units/blob/master/LICENSE.md).
 
+??? info "Supported compilers"
+
+    This library tries to provide the best user experience possible with the C++ language.
+    To achieve that, it extensively uses C++20 features and the
+    [explicit object parameter](https://en.cppreference.com/w/cpp/language/member_functions#Explicit_object_parameter)
+    from C++23.
+
+    Even though the library benefits from C++23 (if available), C++20 is enough to compile and
+    use all of the library's functionality. C++23 features are hidden behind
+    a [preprocessor macro](users_guide/framework_basics/systems_of_quantities.md#defining-quantities)
+    providing a backward-compatible way to use it.
+
+    As of today, the library compiles fine on the following compilers (or newer):
+
+    - gcc-11
+        - please note that we observed some ICEs on gcc-11
+        - no problems with gcc-12.2+
+    - clang-16
+    - apple-clang-15
 
 ```cpp
 #include <mp-units/ostream.h>
@@ -37,6 +56,8 @@ Output:
 Harward Bridge length = 364.4 smoot(2034.57 ft, 620.136 m) +- an ear :-)
 ```
 
+!!! example "[Try it on Compiler Explorer](https://godbolt.org/z/T6Tx93Ysc)"
+
 ??? question "What is `smoot`?"
 
     More on the `smoot` unit can be found at <https://units.fandom.com/wiki/Smoot>.
@@ -53,23 +74,3 @@ Harward Bridge length = 364.4 smoot(2034.57 ft, 620.136 m) +- an ear :-)
     - [P2982: `std::quantity` as a numeric type](https://wg21.link/p2982).
 
     We are actively looking for parties interested in field-trialing the library.
-
-??? info "Supported compilers"
-
-    This library tries to provide the best user experience possible with the C++ language.
-    To achieve that, it extensively uses C++20 features and the
-    [explicit object parameter](https://en.cppreference.com/w/cpp/language/member_functions#Explicit_object_parameter)
-    from C++23.
-
-    Even though the library benefits from C++23 (if available), C++20 is enough to compile and
-    use all of the library's functionality. C++23 features are hidden behind
-    a [preprocessor macro](users_guide/framework_basics/systems_of_quantities.md#defining-quantities)
-    providing a backward-compatible way to use it.
-
-    As of today, the library compiles fine on the following compilers (or newer):
-
-    - gcc-11
-        - please note that we observed some ICEs on gcc-11
-        - no problems with gcc-12.2+
-    - clang-16
-    - apple-clang-15