clean up release scripts; separte out changelog script

script/generate-changelog

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -e
+
+echo "📓  Generating CHANGELOG..."
+npx lerna-changelog

script/release

@@ -1,15 +1,14 @@
 #!/bin/bash
 set -e
+
 echo "📦  Publishing latest release..."
 
 # note: try-publish should exit cleanly if it detects a duplicate
 # published version
-$(npm bin)/lerna exec -- $(pwd)/script/try-publish
+npx lerna exec $@ -- script/try-publish
 
 # Build and publish storybook
-$(npm bin)/build-storybook -o build
+npx build-storybook -o build
 script/publish-storybook
 
-echo "📓  Updated CHANGELOG..."
-
-$(npm bin)/lerna-changelog
+script/generate-changelog

script/release-pr

@@ -1,9 +1,7 @@
 #!/bin/bash
 set -e
+
 echo "🐦  Publishing PR (canary) release..."
+npx lerna publish --npm-tag=pr --canary --exact $@
 
-$(npm bin)/lerna publish --npm-tag=pr --canary --exact $@
-
-echo "📓  Updated CHANGELOG..."
-
-$(npm bin)/lerna-changelog
+script/generate-changelog