Add Docker cleanup script and update README

- Introduced a new script, docker_cleanup.sh, for cleaning up unused Docker containers, images, and volumes to free up disk space.
- Updated README.md to include instructions for using the Docker cleanup script, emphasizing its utility and caution regarding data removal.

scripts/docker_cleanup.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# This script is intended for cleaning up the Docker system.
+# It removes all unused containers, images, networks, and volumes.
+# Use with caution, as this action is irreversible.
+
+echo "Starting Docker cleanup..."
+
+# The 'docker system prune' command removes:
+# - all stopped containers
+# - all networks not used by at least one container
+# - all "dangling" (unreferenced) images
+# - all build cache
+#
+# Additional flags:
+# -a, --all:     Remove all unused images, not just dangling ones.
+# --volumes:   Remove all unused volumes.
+# -f, --force:   Do not prompt for confirmation.
+
+docker system prune -a --volumes -f
+
+echo "Docker cleanup completed successfully."
+