feh: add page (#1891)

pages/linux/feh.md

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+# feh
+
+> Lightweight image viewing utility.
+
+- View images locally or using a URL:
+
+`feh {{path/to/images}}`
+
+- View images recursively:
+
+`feh --recursive {{path/to/images}}`
+
+- View images without window borders:
+
+`feh --borderless {{path/to/images}}`
+
+- Exit after the last image:
+
+`feh --cycle-once {{path/to/images}}`
+
+- Set the slideshow cycle delay:
+
+`feh --slideshow-delay {{seconds}} {{path/to/images}}`
+
+- Set your wallpaper (centered, filled, maximized, scaled or tiled):
+
+`feh --bg-{{center|fill|max|scale|tile}} {{path/to/image}}`

pages/osx/feh.md

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+# feh
+
+> Lightweight image viewing utility.
+
+- View images locally or using a URL:
+
+`feh {{path/to/images}}`
+
+- View images recursively:
+
+`feh --recursive {{path/to/images}}`
+
+- View images without window borders:
+
+`feh --borderless {{path/to/images}}`
+
+- Exit after the last image:
+
+`feh --cycle-once {{path/to/images}}`
+
+- Set the slideshow cycle delay:
+
+`feh --slideshow-delay {{seconds}} {{path/to/images}}`
+
+- Set your wallpaper (centered, filled, maximized, scaled or tiled):
+
+`feh --bg-{{center|fill|max|scale|tile}} {{path/to/image}}`