Add WebP generation script

.gitignore

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+/webp/

generate_webp.zsh

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+#!/usr/bin/env zsh
+# Generates trimmed WebP images from SVGs in svg/.
+# First argument is the size, default is to use the SVG size.
+
+setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
+
+if ! type convert &> /dev/null; then
+    print -u2 "'convert' from imagemagick not found"
+    return 1
+fi
+
+local size=-1
+[[ ${ARGC} > 0 ]] && size=${1}
+
+print "generating WebP images in ${PWD}/webp …"
+mkdir -p webp
+for svg in svg/*.svg; do
+    local webp=${svg##*/}
+    webp=webp/${webp%.*}.webp
+    convert ${svg} -trim -resize ${size} -quality 100 -verbose ${webp}
+done