guake: add page (#2777)

pages/linux/guake.md

@@ -0,0 +1,27 @@
+# guake
+
+> A drop-down terminal for GNOME.
+
+- Toggle Guake visiblity:
+
+`F12`
+
+- Toggle fullscreen mode:
+
+`F11`
+
+- Open a new tab:
+
+`Ctrl+Shift+T`
+
+- Close the terminal:
+
+`Super+X`
+
+- Go to the previous tab:
+
+`Ctrl+PageUp`
+
+- Search the selected text in the browser:
+
+`Shift+Ctrl+L`