slideshow: add page (#23627)

Co-authored-by: Wiktor Perskawiec <wiktor@perskawiec.cc>
Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/common/slideshow.md

@@ -0,0 +1,24 @@
+# slideshow
+
+> Make presentation slides in the Racket language.
+> More information: <https://docs.racket-lang.org/slideshow>.
+
+- Display a default slide with options to run the tutorial or load a `.rkt` presentation file:
+
+`slideshow`
+
+- Start a presentation in full screen:
+
+`slideshow {{path/to/presentation.rkt}}`
+
+- Display the presentation window with a title bar and resize border:
+
+`slideshow --keep-titlebar {{path/to/presentation.rkt}}`
+
+- Set the width and height (in pixels) of the presentation window:
+
+`slideshow {{[-s|--size]}} {{width}} {{height}} {{path/to/presentation.rkt}}`
+
+- Export a presentation to a PDF file:
+
+`slideshow {{[-D|--pdf]}} -o {{path/to/presentation.pdf}} {{path/to/presentation.rkt}}`