[improvement] repo, scripts (#220)

* Fix menu, cleanup package.json

* update changelog

example/scripts/dev.mjs

@@ -0,0 +1,45 @@
+/* eslint-disable no-undef */
+import fs from 'fs'
+import esbuildServe from 'esbuild-serve'
+
+async function main() {
+  if (!fs.existsSync('./dist')) {
+    fs.mkdirSync('./dist')
+  }
+
+  fs.copyFile('./src/index.html', './dist/index.html', (err) => {
+    if (err) throw err
+  })
+
+  try {
+    await esbuildServe(
+      {
+        entryPoints: ['src/index.tsx'],
+        bundle: true,
+        outfile: 'dist/bundle.js',
+        minify: false,
+        sourcemap: true,
+        incremental: true,
+        target: ['chrome58', 'firefox57', 'safari11', 'edge18'],
+        define: {
+          'process.env.NODE_ENV': '"development"',
+        },
+        watch: {
+          onRebuild(err) {
+            serve.update()
+            err ? error('❌ Failed') : log('✅ Updated')
+          },
+        },
+      },
+      {
+        port: 5000,
+        root: './dist',
+        live: true,
+      }
+    )
+  } catch (err) {
+    process.exit(1)
+  }
+}
+
+main()