vncserver: Add page (#1290)

pages/linux/vncserver.md

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+# vncserver
+
+> Launches a VNC (Virtual Network Computing) desktop.
+
+- Launch a VNC Server on next available display:
+
+`vncserver`
+
+- Launch a VNC Server with specific screen geometry:
+
+`vncserver --geometry {{width}}x{{height}}`
+
+- Kill an instance of VNC Server running on a specific display:
+
+`vncserver --kill :{{display_number}}`