Add presskit script

Author: Matthieu Oger

package.json

@@ -15,6 +15,7 @@
     "build": "yarn run build:webpack && yarn run build:jekyll",
     "build:webpack": "webpack -p --env.production",
     "build:jekyll": "bundle exec jekyll clean && JEKYLL_ENV=production bundle exec jekyll build",
+    "presskit": "./update_presskit",
     "test": "standard | snazzy"
   },
   "dependencies": {

update_presskit

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+# If it doesn't work the first time, it means that you have a freshly created repo.
+# The presskit uses the build branch for its published version. We need to be on that branch in `presskit/`.
+# Do that:
+#
+#   cd presskit/ # This is not a folder, but a reference to a remote commit.
+#   git submodule update --remote
+#   git checkout build
+
+# Update.
+cd presskit/
+git checkout build
+git pull --rebase=preserve
+
+# Commit.
+cd ..
+git add presskit/
+git commit --message "Update presskit"