Update Arch Linux package link (#1024)

README.md

@@ -27,15 +27,26 @@ Check the [releases](https://github.com/slackhq/nebula/releases/latest) page for
 
 #### Distribution Packages
 
-- [Arch Linux](https://archlinux.org/packages/community/x86_64/nebula/)
+- [Arch Linux](https://archlinux.org/packages/extra/x86_64/nebula/)
     ```
     $ sudo pacman -S nebula
     ```
+
 - [Fedora Linux](https://src.fedoraproject.org/rpms/nebula)
     ```
     $ sudo dnf install nebula
     ```
 
+- [Debian Linux](https://packages.debian.org/source/stable/nebula)
+    ```
+    $ sudo apt install nebula
+    ```
+
+- [Alpine Linux](https://pkgs.alpinelinux.org/packages?name=nebula)
+    ```
+    $ sudo apk add nebula
+    ```
+
 - [macOS Homebrew](https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/nebula.rb)
     ```
     $ brew install nebula