update examples

example/nodejs-esm/basic-worker-extern-config/README.md

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+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```

example/nodejs-esm/basic-worker-extern-config/config.js

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+import { Encoder } from "flexsearch/esm";
+
+export default {
+    tokenize: "forward",
+    encoder: new Encoder({
+        normalize: function(str){
+            return str.toLowerCase();
+        }
+    })
+};

example/nodejs-esm/basic-worker-extern-config/index.js

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+import { Worker as WorkerIndex } from "flexsearch/esm";
+const dirname = import.meta.dirname;
+
+(async function(){
+
+    // create a simple index which can store id-content-pairs
+    // and await (!) for the worker response
+    const index = await new WorkerIndex({
+        tokenize: "forward",
+        config: dirname + "/config.js"
+    });
+
+    // some test data
+    const data = [
+        'cats abcd efgh ijkl mnop qrst uvwx cute',
+        'cats abcd efgh ijkl mnop qrst cute',
+        'cats abcd efgh ijkl mnop cute',
+        'cats abcd efgh ijkl cute',
+        'cats abcd efgh cute',
+        'cats abcd cute',
+        'cats cute'
+    ];
+
+    // add test data
+    data.forEach((item, id) => {
+        index.add(id, item);
+    });
+
+    // perform query
+    const result = await index.search({
+        query: "cute cat",
+    });
+
+    // display results
+    result.forEach(i => {
+        console.log(data[i]);
+    });
+
+}());

example/nodejs-esm/basic-worker-extern-config/package.json

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+{
+  "name": "nodejs-esm-document-worker",
+  "type": "module",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
+  }
+}