feat(ostree-images): import river template files from wayblue

ostree-images/river/files/scripts/removeunprofessionalwallpapers.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Tell build process to exit if there are any errors.
+set -oue pipefail
+
+for file in /usr/share/hyprland/*.png; do
+    if [[ $file == *anime*.png || $file == wall2.png ]]; then
+        rm "$file"
+        echo "Removed: $file"
+    fi
+done