build(desktop): improve desktop build process, update assets

resources/generate.sh

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+# This script requires Sketch on macOS – see readme.md for details
+
+# export all slices marked for export to the proper directory
+echo "Exporting all assets from src.sketch..."
+sketchtool export layers src.sketch
+
+function postprocess {
+  echo "Beginning postprocessing for $1..."
+
+  echo "Postprocessing assets for macOS..."
+  iconset $1 app
+  iconset $1 volume-icon
+
+  echo "Creating Retina-ready DMG background..."
+  tiffutil -cathidpicheck $1/mac/dmg-background.png $1/mac/dmg-background@2x.png -out $1/mac/dmg-background.tiff
+  echo "Removing raw background pngs..."
+  rm $1/mac/dmg-background.png $1/mac/dmg-background@2x.png
+}
+
+function iconset {
+  echo "Converting $1 $2 iconset to icns..."
+  iconutil --convert icns $1/mac/$2.iconset --output $1/mac/$2.icns
+  echo "Removing $1 $2 iconset..."
+  rm -r $1/mac/$2.iconset
+}
+
+postprocess copay
+postprocess bitpay

resources/install.sh

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+# This installs sketchtool: https://www.sketchapp.com/tool/
+sh /Applications/Sketch.app/Contents/Resources/sketchtool/install.sh

resources/readme.md

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+# Copay Project Resources
+
+This directory contains a `src.sketch` file from which all other assets are exported or derived.
+
+## Requirements
+
+You'll need [Sketch](https://www.sketchapp.com/) to make any changes to this directory.
+
+Sketch is only available for macOS, and several processes in `generate.sh` require utilities that ship with the OS, so this process must be performed on macOS.
+
+## Install sketchtool
+
+If you do not have `sketchtool` installed, you'll first need to install it.
+
+```sh
+install.sh
+```
+
+## Generate assets
+
+To make an update, first make the change in `src.sketch`, then run:
+
+```sh
+sh generate.sh
+```
+
+## Commit the changes
+
+Be sure to commit the modified `src.sketch`, as well as any modified exported assets.