Image ingestion QoL improvements

[vkrd]

Motivation and Context

While running some tests with large documents, I modified the script for some quality-of-life improvements.

Description

• More descriptive comments
• Now the image only scales up by 200% if either dimension is smaller than 3 inches
• Prevent a bug where the image didn't correspond to any text, so it would just insert the image in between every character
• Limit the number of replacements to 1, so it takes less time

Contribution Checklist

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.
• I didn't break any existing functionality 😄