Move pages under tldr, lint run.sh, update docs

tldr/x11docker

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# x11docker
+
+> Securely run GUI applications and desktop UIs in Docker containers.
+> See also `xephyr`.
+> More information: <https://github.com/mviereck/x11docker>.
+
+- Launch VLC in a container:
+
+`x11docker --pulseaudio --share={{$HOME/Videos}} {{jess/vlc}}`
+
+- Launch Xfce in a window:
+
+`x11docker --desktop {{x11docker/xfce}}`
+
+- Launch GNOME in a window:
+
+`x11docker --desktop --gpu --init={{systemd}} {{x11docker/gnome}}`
+
+- Launch KDE Plasma in a window:
+
+`x11docker --desktop --gpu --init={{systemd}} {{x11docker/kde-plasma}}`
+
+- Display help:
+
+`x11docker --help`