feat: redesign the project structure

home/linux/wallpapers/convert_to_png.nu

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+# convert all images to png
+
+def to_png [old_path: string, old_format: string] {
+  # 将后缀改为 .png 得到新图片的 path
+  let webp_path = ($old_path | split row $old_format | append ".png" | str join)
+  # 使用 ffmpeg 进行格式转换
+  ffmpeg -y -i $old_path $webp_path
+  # 删除旧图片
+  rm $old_path
+}
+
+def convert_format [old_format: string] {
+    # 递归找出所有大于 10kib 的图片
+    let old_paths = (ls $"**/*($old_format)" | where size > 10kb | each {|it| $it.name})
+    $old_paths | to md
+
+    # 1. 执行图片格式转换与压缩，同时删除原图片
+    $old_paths | each { |it| to_png $it $old_format }
+}
+
+convert_format ".webp"
+# convert_format ".jpg"