feat(arch): update Btrfs snapshots section

Signed-off-by: chris1320 <chris1320is@protonmail.com>

Author: Chris1320

Operating Systems/Arch Linux/Contents/Manual Customization.md

@@ -607,6 +607,15 @@ We will use [Snapper](https://snapper.io/) to create snapshots and [Btrfs Assist
 
 ```bash
 paru -S snapper snap-pac btrfs-assistant inotify-tools
+
+# Temporarily unmount `/.snapshots` to let snapper create the config
+sudo umount /.snapshots
+sudo rm -r /.snapshots
+sudo snapper -c root create-config /
+sudo btrfs subvolume delete /.snapshots
+sudo mount --mkdir -o noatime,compress-force=zstd:3,subvol=@snapshots /dev/sda4 /.snapshots  # use the same options you used from Manual Customization guide
+cat /etc/fstab
+
 systemctl enable snapper-boot.timer
 ```
 
@@ -630,10 +639,6 @@ HOOKS=(... grub-btrfs-overlayfs)
 
 After saving and closing the file, run `mkinitcpio -P`.
 
-### Setting Up Snapper
-
-Start Btrfs Assistant and go to the *Snapper Settings* tab. Click *New* and name it `root` with backup path `/`. Enable *timeline snaphots*, adjust the snapshot retention times, and click *Save*. Enable *timeline*, *cleanup*, and *boot* in *systemd Unit Settings* section.
-
 ## Ricing Up GRUB
 
 Our whole system mostly uses the [Catppuccin](https://catppuccin.com/) colorscheme, so we're going to use [Catppuccin's GRUB theme](https://github.com/catppuccin/grub) to rice our bootloader.