Lesly update name instance

[Leslyp]

Summary by OpenAI

New Feature:

• Project renamed to "RedRover - An OpenAI ChatGPT-based PR reviewer and summarizer"
• Updated image in README.md
• Replaced all instances of "@openai" with "@RedRover" in src/review.ts
• Updated log messages

Chore:

• Changed default value of openai_heavy_model from 'gpt-3.5-turbo' to 'gpt-4'

🎉 RedRover, RedRover, we've made the switch over! 🚀 A new name, a fresh face, our project's got a makeover! 🌟 With GPT-4, we'll soar, reaching heights never seen before! 🦅

[github-actions[bot]]

:robot: OpenAI

The overall change renames the project to "RedRover" and updates the default AI model from 'gpt-3.5-turbo' to 'gpt-4'. This may impact the behavior and performance of the code, requiring a thorough review.

Files	Summary
README.md, src/review.ts	Updates project title, image, and replaces "@openai" with "@RedRover". Updates log messages accordingly.
action.yml	Changes the default value of openai_heavy_model from 'gpt-3.5-turbo' to 'gpt-4'.

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In the recent run, only the files that changed from the base of the PR and between 3e70a189d4b85f11a70daff12b7862d620f9d8b5 and 0da09f30f49be4258e50f7fccc346c31443af6e7 commits were reviewed.

Files not reviewed due to simple changes (2)

### Skipped review in the recent run * README.md * src/review.ts