terminator: add page (#1994)

pages/linux/terminator.md

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+# terminator
+
+> Arrange multiple GNOME terminals in one window.
+
+- Start terminator window:
+
+`terminator`
+
+- Start with a fullscreen window:
+
+`terminator -f`
+
+- Split terminals horizontally:
+
+`Ctrl + Shift + O`
+
+- Split terminals vertically:
+
+`Ctrl + Shift + E`
+
+- Open new tab:
+
+`Ctrl + Shift + T`