Update arch.md (#1404)

Co-authored-by: Antonis Stamatiou <[email protected]>
Co-authored-by: Carrie Warner (Mattermost) <[email protected]>

site/content/contribute/more-info/desktop/developer-setup/arch.md

@@ -1,25 +1,32 @@
 **NOTE:** We don't officially support Arch Linux for use with the Mattermost Desktop App. The provided guide is unofficial.
 
-1. Open Terminal
-2. Install NodeJS via [nvm](https://github.com/nvm-sh/nvm#installing-and-updating):
+1. Open a terminal
+2. Install nvm via
+   1. [nvm-sh](https://github.com/nvm-sh/nvm#installing-and-updating):
+      ```sh
+      curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.5/install.sh | bash
+      ```
+      OR
+   2. [AUR](https://aur.archlinux.org/) (possibly using [a helper](https://wiki.archlinux.org/title/AUR_helpers)):
+      ```sh
+      yay -S nvm
+      ```
+4. Install NodeJS via
+   ```sh
+   nvm install --lts
+   ```
+6. Install other dependencies:
 
-    ```sh
-    curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.5/install.sh | bash
-    nvm install --lts
-    ```
-
-3. Install other dependencies:
-
-    Linux requires the X11 developement libraries and `libpng` to build native Node modules.
+    Linux requires the X11 development libraries and `libpng` to build native Node modules.
     Arch requires `libffi` since it's not installed by default.
 
     ```sh
-    sudo pacman -S install npm git python3 gcc make libx11 libxtst libpng libffi
+    sudo pacman -S npm git python3 gcc make libx11 libxtst libpng libffi
     ```
 
 #### Notes
 * To build RPMs, you need `rpmbuild`
 
     ```sh
-    sudo pacman -S install rpm
-    ```
+    sudo pacman -S rpm
+    ```