Update the example code with references to real PSDs

[velara3]

On the following page the example code contains references to the domain "host" as shown here:

const libFiles = require('@adobe/aio-lib-files')
const sdk = require('@adobe/aio-lib-photoshop-api')

async function sdkTest() {
  try {
    // initialize sdk
    const files = await libFiles.init();
    const client = await sdk.init('<ims org id>', '<api key>', '<valid auth token>', files)

    // call methods
    // auto cutout...
    const result = await client.createCutout('http://host/input.jpg', 'path/output.jpg')
    console.log(result)

This is not helpful to use example domains because there is no way to test if that code works or not because it's not pointing to a real example.

Please use real examples so we can know that when errors occur if it is our code.

Before:

    const result = await client.createCutout('http://host/input.jpg', 'path/output.jpg')
    console.log(result)

After:

    const result = await client.createCutout('http://www.adobe.com/test-psd.psd', 'path/output.jpg')
    console.log(result)

https://github.com/adobe/aio-lib-photoshop-api?tab=readme-ov-file#usage