Lambda extract_text_from_textract_async_job_output.py where is only writing Page 1 in the output.

There's an issue within the Lambda function extract_text_from_textract_async_job_output.py where it's only writing Page 1 in the output.

Even though it fetches all pages from Textract and iterates through all the nextToken, when it saves the Python object 'pages', it only saves the content of the first page (line 27).

```python
content=pages[1]['Content']
```

https://github.com/aws-samples/aws-textract-comprehend-lex-chatbot/blob/5c8b069eae56314bc744ae85ed1ef5598296d811/src/lambda/extract_text_from_textract_async_job_output.py#L27C3-L27C32

For my purposes, I've made the following adjustment:

```python
content=json.dumps(pages, indent=4, separators=(", ", ": "), ensure_ascii=False)
```

However, this alteration pertains to a different use case, and it might not necessarily be the optimal solution for the example scenario.

Open src/lambda/extract_text_from_textract_async_job_output.py and inspect the page collection around line 27, where only pages[1]['Content'] is saved. Trace how all Textract pages and nextToken results are assembled, then determine the output expected by this example. Done means the saved output represents the fetched pages rather than only Page 1.

Written by the indexing model from the issue text.