documentation refactoring

docs/display-managers/lightdm.md

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+# lightdm
+
+LightDM is a lightweight, cross-desktop display manager used to handle graphical logins on Linux systems. It provides the login screen (called a greeter) and manages user sessions, including authentication and session launching.
+
+**🧭 Key Features of LightDM:**
+
+- Lightweight and fast: Designed to use minimal system resources compared to heavier alternatives like GDM (GNOME Display Manager).
+- Cross-desktop compatibility: Works with GNOME, KDE, Xfce, LXDE, and other desktop environments.
+- Greeter flexibility: Supports multiple greeter front-ends, such as:
+  - LightDM GTK Greeter (default for many distros)
+  - Slick Greeter (used by Linux Mint)
+  - Webkit Greeter (HTML/CSS-based)
+- Remote login support: Includes protocols like XDMCP and VNC for remote graphical sessions.
+- Guest sessions and autologin: Can be configured for temporary guest accounts or automatic login.
+
+**Disable suspend black screen:**
+
+```bash
+# /etc/lightdm/lightdm.conf
+[Seat:*]
+xserver-command=X -s 0 dpms
+```
+
+**Lightdm auto login:**
+
+```bash
+# /etc/lightdm/lightdm.conf
+[SeatDefaults]
+autologin-user=public
+autologin-user-timeout=5
+# Uncomment the following, if running Unity
+#greeter-session=unity-greeter
+```