Add KDE Plasma installation guide and revert documentation

chromium-setup/revert-to-lxde.sh

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+#!/bin/bash
+# Revert to LXDE Desktop Environment
+# This script helps revert from KDE Plasma back to LXDE
+
+echo "=== Reverting to LXDE Desktop Environment ==="
+echo ""
+
+# Check if running as root for some operations
+if [ "$EUID" -ne 0 ]; then 
+    echo "Some operations require sudo. You may be prompted for your password."
+    echo ""
+fi
+
+# Method 1: Change default session
+echo "Step 1: Setting LXDE as default session..."
+echo "You will be prompted to select the session manager."
+echo ""
+sudo update-alternatives --config x-session-manager
+
+# Method 2: Verify LXDE packages are still installed
+echo ""
+echo "Step 2: Verifying LXDE packages..."
+if dpkg -l | grep -q "lxsession"; then
+    echo "✓ LXDE packages are installed"
+else
+    echo "⚠ LXDE packages not found. Reinstalling..."
+    sudo apt-get update
+    sudo apt-get install --reinstall lxde
+fi
+
+# Method 3: Check available sessions
+echo ""
+echo "Step 3: Available desktop sessions:"
+ls -1 /usr/share/xsessions/ | grep -E "openbox|rpd|lxde" || echo "No LXDE sessions found"
+
+echo ""
+echo "=== Revert Complete ==="
+echo ""
+echo "To use LXDE:"
+echo "1. Log out of current session"
+echo "2. At login screen, click on session/desktop selector"
+echo "3. Select 'Openbox' or 'RPD-X' session"
+echo "4. Log in"
+echo ""
+echo "Or reboot and select LXDE at login:"
+echo "  sudo reboot"