Update install guide

README.org

@@ -31,17 +31,18 @@ Wallman currently has three main features:
 
 ** Installing with package Manager
 *** Gentoo
-This program, as of now, can be installed very easily on gentoo. Just follow these instructions:
-#+BEGIN_SRC shell
-git clone https://git.entheuer.de/emma/Wallman.git
-doas eselect repository create wallman
-doas cp -rf Wallman/distfiles/Gentoo/wallman /var/db/repos/
-doas emerge -av wallman
-#+END_SRC
-A proper portage overlay will be created soon, so that updates can be handled automatically.
+Gentoo support has been dropped for now, as I currently don't have a Gentoo system to build on.
 
 *** Arch Linux
-Support for Arch Linux will be added soon.
+There is a PKGBUILD file provided in packaging/Arch. Do:
+#+BEGIN_SRC shell
+cp packaging/Arch/PKGBUILD ./
+makepkg -si
+mkdir ~/.config/wallman
+cp /etc/wallman/sample_config.toml ~/.config/wallman/wallman.toml
+#+END_SRC
+Simply edit the config file and you're done.
+I am currently working to get this into the AUR.
 
 *** Others
 I will potentially write a version for nixpkgs and will also bundle wallman as a flatpak.