Remove ESM build

Since there is nothing to import, I don't think ESM can be really used.

package.json

@@ -23,10 +23,8 @@
     "README.md"
   ],
   "main": "./dist/shareon.cjs",
-  "module": "./dist/shareon.mjs",
   "exports": {
-    "require": "./dist/shareon.cjs",
-    "import": "./dist/shareon.mjs"
+    "require": "./dist/shareon.cjs"
   },
   "unpkg": "./dist/shareon.min.js",
   "scripts": {
@@ -67,8 +65,7 @@
     {
       "limit": "1 KB",
       "path": [
-        "./dist/shareon.cjs",
-        "./dist/shareon.mjs"
+        "./dist/shareon.cjs"
       ]
     },
     {

rollup/rollup.config.prod.js

@@ -8,11 +8,6 @@ const outputDir = './dist/';
 export default {
   input,
   output: [
-    {
-      name,
-      format: 'esm',
-      file: `${outputDir}${name}.mjs`,
-    },
     {
       name,
       format: 'cjs',