Create favicons

Execute the following commands to build a set of favicons from a pic.png.

$ magick pic.png -resize 16x16 -background none -flatten favicon.ico
$ magick pic.png -resize 16x16 -background none -flatten favicon-16x16.png
$ magick pic.png -resize 32x32 -background none -flatten favicon-32x32.png
$ magick pic.png -resize 48x48 -background none -flatten favicon-48x48.png
$ magick pic.png -resize 96x96 -background none -flatten favicon-96x96.png
$ magick pic.png -resize 192x192 -background none -flatten favicon-192x192.png