nautilus: add page (#5735)

pages/linux/nautilus.md

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+# nautilus
+
+> Default file explorer for GNOME desktop environment.
+> Also known as GNOME Files.
+> More information: <https://manned.org/nautilus>.
+
+- Launch Nautilus:
+
+`nautilus`
+
+- Launch Nautilus as root user:
+
+`sudo nautilus`
+
+- Launch Nautilus and display a specific directory:
+
+`nautilus {{path/to/directory}}`
+
+- Launch Nautilus with a specific file or directory selected:
+
+`nautilus --select {{path/to/file_or_directory}}`
+
+- Launch Nautilus in a separated window:
+
+`nautilus --new-window`
+
+- Close all Nautilus instances:
+
+`nautilus --quit`
+
+- Display help:
+
+`nautilus --help`