update readme (#65)

<!-- This is an auto-generated comment: release notes by openai -->
### Summary by OpenAI

**Release Notes**

This pull request removes two images from the README.md file. This is a
documentation change that does not affect the functionality of the code.
<!-- end of auto-generated comment: release notes by openai -->

Author: harjotgill

README.md

@@ -84,8 +84,6 @@ Example:
 
 ![PR Conversation](./docs/images/openai-review-conversation.png)
 
-![PR Conversation Request](./docs/images/openai-review-request.png)
-
 #### Environment variables
 
 - `GITHUB_TOKEN`: This should already be available to the GitHub Action