Add script to generate Play Store screenshot sizes

- Introduced a Node.js script (`playstore-screenshot-sizes.mjs`) to resize images for Play Store screenshots based on predefined profiles (phone, tablet-7, tablet-10).
- The script reads images from a specified input directory, processes them, and saves the resized images in an output directory with appropriate naming conventions.
- Added a Bash wrapper script (`playstore-screenshot-sizes.sh`) to execute the Node.js script easily from the command line.

scripts/anonymize-playstore-screenshot.sh

@@ -24,7 +24,7 @@ IFS=';' read -r -a BOXES <<< "$RECTS"
 for box in "${BOXES[@]}"; do
   IFS=',' read -r x y w h <<< "$box"
   magick "$TMP" \
-    \( -size "${w}x${h}" xc:black -alpha set -channel a -evaluate set 70% +channel \) \
+    \( -size "${w}x${h}" xc:black -alpha off \) \
     -geometry "+${x}+${y}" -composite "$TMP"
 done