reorganize hackmd scripts

packages/hackmd/package.json

@@ -5,7 +5,13 @@
   "license": "MIT",
   "main": "dist/index.js",
   "scripts": {
-    "build": "vite build && npx -y shx cp ./src/index.js ./dist"
+    "build": "vite build",
+    "clean": "npx -y shx rm -rf dist types",
+    "dev": "vite build --mode dev",
+    "watch": "yarn dev -w'",
+    "lint:js": "eslint **/*.{js,ts}",
+    "lint": "npm-run-all -p lint:*",
+    "test": "jest --verbose"
   },
   "dependencies": {},
   "devDependencies": {