contents -> install entry text

hugo/content/installation/_index.md

@@ -5,13 +5,12 @@ weight = 20
 
 ## Install or build BornAgain
 
-BornAgain is supported under Windows, Mac OS X and Linux operating systems.
-For Windows, MacOS and major Linux platforms as well as their derivatives (like Debian,
-ArchLinux, Fedora, Ubuntu and Manjaro) we provide self-contained binary installers.
+BornAgain is supported under the operating systems Linux, Windows, and Mac OS X.
 
-For Unix-like operating systems (including Linux and MacOS) we also provide
-instructions for building from source.
+For each of these, we provide self-contained binary installers,
+as described in the [Install](install) section.
 
-Here are the platform specific instructions:
+For Linux, it may be even more convenient to use the Debian/Ubuntu package
+provided by external maintainers at https://tracker.debian.org/pkg/bornagain.
 
-{{% children  %}}
+See the [Build](build) section to compile BornAgain from source.