Move pages under tldr, lint run.sh, update docs

tldr/feh

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# feh
+
+> Lightweight image viewing utility.
+> More information: <https://feh.finalrewind.org>.
+
+- 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}}`
+
+- Use a specific slideshow cycle delay:
+
+`feh --slideshow-delay {{seconds}} {{path/to/images}}`
+
+- Use a specific wallpaper mode (centered, filled, maximized, scaled or tiled):
+
+`feh --bg-{{center|fill|max|scale|tile}} {{path/to/image}}`
+
+- Create a montage of all images within a directory, outputting as a new image:
+
+`feh --montage --thumb-height {{150}} --thumb-width {{150}} --index-info "{{%nn%wx%h}}" --output {{path/to/montage_image.png}}`