Update README.md and screenshot

Signed-off-by: Severin Kaderli <severin@kaderli.dev>

README.md

@@ -13,13 +13,10 @@ The installation is pretty straightforward with the help of the included install
 3. Reboot the system
 
 ## Contents
-This repository basically contains every important config file that I need for my Linux setup. The following is just a small part of it.
-
-* zsh
-* i3
-* Polybar
-* Compton
-* Alacritty
+This repository basically contains every important configuration file and script
+that I need for my Linux setup. The main content can be found in the `system`
+directory. The `packages` directory contains lists of packages of my system that
+get installed with the install script.
 
 ## Keybindings
 | Keybinding                                       | Description                      |