[ImgBot] Optimize images (#10)

## Beep boop. Your images are optimized!

Your image file size has been reduced by **6%** 🎉

<details>
<summary>
Details
</summary>

| File | Before | After | Percent reduction |
|:--|:--|:--|:--|
| /docs/images/chatgpt-pr-release-notes.png | 37.60kb | 27.01kb | 28.15%
|
| /docs/images/chatgpt-pr-summary.png | 204.06kb | 150.31kb | 26.34% |
| /docs/images/chatgpt-pr-review.png | 124.81kb | 93.86kb | 24.80% |
| /docs/images/ai.png | 1,946.03kb | 1,904.58kb | 2.13% |
| | | | |
| **Total :** | **2,312.50kb** | **2,175.76kb** | **5.91%** |
</details>

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Author: imgbot[bot]