fix: remove unnecessary static method (#8)

This pull request includes changes to the `IDWatermark` class in
`src/index.js` to improve the image loading process and simplify the
codebase. The most important changes include replacing the `loadImage`
method with a direct call to `createImageBitmap` and removing the now
redundant `loadImage` method.

Improvements to image loading process:

*
[`src/index.js`](diffhunk://#diff-bfe9874d239014961b1ae4e89875a6155667db834a410aaaa2ebe3cf89820556L80-R80):
Replaced the call to `IDWatermark.loadImage` with a direct call to
`createImageBitmap` in the `addWatermark` method.

Codebase simplification:

*
[`src/index.js`](diffhunk://#diff-bfe9874d239014961b1ae4e89875a6155667db834a410aaaa2ebe3cf89820556L212-L222):
Removed the `loadImage` static method from the `IDWatermark` class as it
is no longer needed.

Author: matiaslopezd

src/index.js

@@ -77,7 +77,7 @@ class IDWatermark {
    */
     async addWatermark(imageInput, watermarkText, encodeOptions = {}) {
 
-    const image = await IDWatermark.loadImage(imageInput, this.bitmapOptions);
+    const image = await createImageBitmap(imageInput, this.bitmapOptions);
 
     const canvas = new OffscreenCanvas(image.width, image.height);
     const ctx = canvas.getContext('2d', { willReadFrequently: true });
@@ -209,17 +209,6 @@ class IDWatermark {
     ctx.putImageData(imageData, 0, 0);
   }
 
-  /**
-   * Loads an image from a source.
-   *
-   * @param {File|Blob|ImageData|ImageBitmap|OffscreenCanvas|VideoFrame|HTMLImageElement|SVGImageElement|HTMLCanvasElement} input - The input image.
-   * @param {Object} options - ImageBitmap options.
-   * @returns {Promise<ImageBitmap>} - A promise that resolves to an ImageBitmap.
-   */
-  static async loadImage(input, options = {}) {
-    return createImageBitmap(input, options);
-  }
-
   /**
    * Returns the default options for the watermark.
    *