distrobox: add page (#7638)

pages/linux/distrobox-enter.md

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+# distrobox-enter
+
+> Run a command in a Distrobox container.
+> Default command executed is your SHELL, but you can specify different shells or entire commands to execute. If used inside a script, an application, or a service, you can specify the --headless mode to disable tty and interactivity.
+> More information: <https://distrobox.privatedns.org>.
+
+- Enter a distrobox and run `sh -l`:
+
+`distrobox-enter container-name -- sh -l`
+
+- Enter a distrobox without instantiating a tty:
+
+`distrobox-enter -H container-name -- uptime -p`