Withdraw the Arch Linux images

Toolbx now offers built-in support for Arch Linux and these images are
maintained as part of the Toolbx project.

toolbx-images#82

Author: debarshiray

.github/workflows/archlinux.yaml

@@ -60,10 +60,11 @@ directly use the commands below:
   $ toolbox enter amazonlinux-toolbox-2
   ```
 
-- [Arch Linux]:
+- [Arch Linux]: The images are now maintained as part of [Toolbx] ([GitHub])
+  ([repo on Quay.io](https://quay.io/repository/toolbx/arch-toolbox)).
   ```
-  $ toolbox create --image quay.io/toolbx-images/archlinux-toolbox:latest
-  $ toolbox enter archlinux-toolbox-latest
+  $ toolbox create --distro arch
+  $ toolbox enter arch-toolbox-latest
   ```
 
 - [CentOS (Stream)] with [EPEL] enabled by default: