Add information about the AUR packages to docs

Signed-off-by: Aurel Canciu <aurelcanciu@gmail.com>

README.md

@@ -36,6 +36,16 @@ curl -s https://toolkit.fluxcd.io/install.sh | sudo bash
 . <(flux completion bash)
 ```
 
+Arch Linux (AUR) packages:
+
+There are three packages published in AUR:
+- [flux-bin](https://aur.archlinux.org/packages/flux-bin): install the latest
+  stable version using a pre-build binary (recommended)
+- [flux-go](https://aur.archlinux.org/packages/flux-go): build the latest
+  stable version from source code
+- [flux-scm](https://aur.archlinux.org/packages/flux-scm): build the latest
+  (unstable) version from source code from our git `main` branch
+
 Binaries for macOS, Windows and Linux AMD64/ARM are available to download on the
 [release page](https://github.com/fluxcd/flux2/releases).
 

docs/get-started/index.md

@@ -34,6 +34,15 @@ curl -s https://toolkit.fluxcd.io/install.sh | sudo bash
 
 The install script downloads the flux binary to `/usr/local/bin`.
 
+If using Arch Linux, there are three packages published in AUR you can use to
+install `flux`:
+- [flux-bin](https://aur.archlinux.org/packages/flux-bin): install the latest
+  stable version using a pre-build binary (recommended)
+- [flux-go](https://aur.archlinux.org/packages/flux-go): build the latest
+  stable version from source code
+- [flux-scm](https://aur.archlinux.org/packages/flux-scm): build the latest
+  (unstable) version from source code from our git `main` branch
+
 Binaries for **macOS**, **Windows** and **Linux** AMD64/ARM are available for download on the
 [release page](https://github.com/fluxcd/flux2/releases).