Replace webpack with only esbuild, replace react with preact

reduce node_modules size to only 18M

reduce js file bundle to 20%

web/build.js

@@ -0,0 +1,20 @@
+const fs = require("fs");
+const esbuild = require("esbuild");
+
+(async () => {
+  fs.rmSync("build", { recursive: true, force: true });
+  fs.cpSync("public", "build", { recursive: true });
+
+  const result = await esbuild.build({
+    entryPoints: ["src/index.jsx"],
+    bundle: true,
+    outfile: "build/msw-open-music.js",
+    sourcemap: true,
+    minify: true,
+    metafile: true,
+  });
+
+  const text = await esbuild.analyzeMetafile(result.metafile);
+  console.log(text);
+  console.log("Build done, output files udner ./build directory");
+})();