docs: remove IIFE mention and keep only ESM

Author: ghiscoding

README.md

@@ -46,14 +46,8 @@ npm install excel-builder-vanilla
 The project is now only offered as an ESM Only build
 
 ```ts
-// ESM (preferred) - npm install
+// ESM import
 import { createWorksheet } from 'excel-builder-vanilla';
-
-// IIFE - CDN
-<script src="https://cdn.jsdelivr.net/npm/excel-builder-vanilla@4.2.0/dist/excel-builder.iife.js"></script>
-<script>
-  const worksheet = ExcelBuilder.createWorksheet();
-</script>
 ```
 
 ### CSP (Content Security Policy)

docs/README.md

@@ -12,22 +12,10 @@ npm install excel-builder-vanilla
 ```
 
 ```ts
-// ESM (preferred)
+// ESM import
 import { createWorkbook, createWorksheet } from 'excel-builder-vanilla';
 ```
 
-or from CDN with standalone script (IIFE)
-```html
-<script src="https://cdn.jsdelivr.net/npm/excel-builder-vanilla@4.2.0/dist/excel-builder.iife.js"></script>
-<script>
-  const worksheet = ExcelBuilder.createWorksheet();
-</script>
-```
-
-{% hint style="warning" %}
-**Warning** ESM import is the preferred approach and IIFE might actually be removed in the future to lower download size even further.
-{% endhint %}
-
 ### Features Supported
 
 - Number and date formatting

packages/excel-builder-vanilla/README.md

@@ -14,9 +14,6 @@ Available [**Live demo**](https://ghiscoding.github.io/excel-builder-vanilla/) w
 npm install excel-builder-vanilla
 ```
 
-The project only offers 1 bundle type
-- ESM: to `import from` (preferred)
-
 ```ts
 // ESM - npm install
 import { createWorksheet } from 'excel-builder-vanilla';