[web] Fixed CMake install instructions for Ubunut.

web/content/docs/devguide/getting-started/prerequisites.pandoc

@@ -229,16 +229,7 @@ brew install python
 :::
 
 ::: {.linux}
-Install CMake via Kitware's APT Repository (for Ubuntu 18.04 onwards):
-
-```bash
-$ sudo apt-get update
-$ sudo apt-get install apt-transport-https ca-certificates gnupg software-properties-common wget
-$ wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | sudo apt-key add -
-$ sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main'
-$ sudo apt-get update
-$ sudo apt-get install cmake
-```
+Install CMake via Kitware's APT Repository by [following their instructions](https://apt.kitware.com/).
 
 For other linux distributions you want to use your distributions package manager, [pip](https://pypi.org/project/cmake/) or [snap](https://snapcraft.io/cmake).
 :::