feat: add most appropriate MIME types

https://www.iana.org/assignments/media-types/media-types.xhtml#image

flake.nix

@@ -58,6 +58,16 @@
               desktopName = name;
               icon = name;
               exec = name;
+              mimeTypes = [
+                "image/png"
+                "image/jpeg"
+                "image/gif"
+                "image/webp"
+                "image/avif"
+                "image/tiff"
+                "image/bmp"
+                "image/vnd.microsoft.icon" # .ico
+              ];
             };
           in
           craneLib.buildPackage (