gh-screensaver: add page (#6578)

pages/common/gh-screensaver.md

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+# gh screensaver
+
+> Extension for GitHub CLI that runs animated terminal screensavers.
+> See also: `gh extension`.
+> More information: <https://github.com/vilmibm/gh-screensaver>.
+
+- Run a random screensaver:
+
+`gh screensaver`
+
+- Run a specific screensaver:
+
+`gh screensaver --saver {{fireworks|marquee|pipes|pollock|starfield}}`
+
+- Run the "marquee" screensaver with a specific text and font:
+
+`gh screensaver --saver {{marquee}} -- --message="{{message}}" --font={{font_name}}`
+
+- Run the "starfield" screensaver with a specific density and speed:
+
+`gh screensaver --saver {{starfield}} -- --density {{500}} --speed {{10}}`
+
+- List available screensavers:
+
+`gh screensaver --list`