build: delete Rollup config

rollup.config.js

@@ -1,27 +0,0 @@
-import { terser } from "rollup-plugin-terser";
-import pkg from "./package.json";
-import resolve from "@rollup/plugin-node-resolve";
-import commonjs from "@rollup/plugin-commonjs";
-import svelte from "rollup-plugin-svelte";
-
-export default ["es", "umd"].map((format) => {
-  const UMD = format === "umd";
-
-  return {
-    input: "src",
-    inlineDynamicImports: true,
-    output: {
-      format,
-      file: UMD ? pkg.main : pkg.module,
-      name: UMD ? "carbon-components-svelte" : undefined,
-      globals: { flatpickr: "flatpickr" },
-    },
-    external: Object.keys(pkg.dependencies),
-    plugins: [
-      svelte({ emitCss: false }),
-      resolve(),
-      commonjs(),
-      UMD && terser(),
-    ],
-  };
-});