feat: refactor modern *nix tools presentation

Author: yozachar

README.md

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+  "broot.png": "https://raw.githubusercontent.com/Canop/broot/master/website/docs/img/20200629-overview.png",
+  "cheat.png": "https://static.haydenjames.io/wp-content/uploads/2020/09/cheat-command-line-github-868x478.png",
+  "choose.png": "https://asciinema.org/a/315932.png",
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+  "eza.png": "https://raw.githubusercontent.com/eza-community/eza/main/docs/images/screenshots.png",
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+  "gtop.gif": "https://raw.githubusercontent.com/aksakalli/gtop/master/img/demo.gif",
+  "httpie.gif": "https://raw.githubusercontent.com/httpie/httpie/master/docs/httpie-animation.gif",
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+  "jq.png": "https://blog.noenieto.com/media/gnome-shell-screenshot-VMABUZ.png",
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+  "sd.png": "https://rest-reminder.easiestsoft.com/web/command-line-search-replace-string-in-file/img/regular-expression-replace-string-in-file.png",
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+  "xh.gif": "https://raw.githubusercontent.com/ducaale/xh/master/assets/xh-demo.gif",
+  "zoxide.riff": "https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/contrib/tutorial.webp"
+}

links.json

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+#!/bin/bash
+
+mkdir -p ./screenshots
+jq -r 'to_entries[] | .key + " " + .value' ./links.json | while read -r key url; do
+    if [ -f "$key" ]; then
+        echo "$key exists"
+        continue
+    fi
+    curl -fsSL "$url" -o "./screenshots/$key"
+    echo "* downloaded ./screenshots/$key"
+done
+
+# Note: use
+# echo $(file screenshots/IMAGE_FILE_NAME | awk -F' ' '{print $2}' | tr '[:upper:]' '[:lower:]')
+# to get the extension name