Losslessly optimize PNG images under public/ & src/

64 images compressed as result, images under screenshots/ are ignored:

```
public/bots/360-ai-brain-logo.png         | Bin 16165 -> 10553 bytes
public/bots/alpaca-logo.png               | Bin 56028 -> 48958 bytes
public/bots/azure-openai-logo.png         | Bin 24983 -> 16060 bytes
public/bots/bing-balanced-logo.png        | Bin 47316 -> 34379 bytes
public/bots/bing-creative-logo.png        | Bin 48184 -> 35164 bytes
public/bots/bing-precise-logo.png         | Bin 46833 -> 33832 bytes
public/bots/chatglm-3-logo.png            | Bin 18212 -> 11536 bytes
public/bots/chatglm-4-logo.png            | Bin 17037 -> 10404 bytes
public/bots/chatglm2-logo.png             | Bin 39193 -> 29615 bytes
public/bots/chatglm3-logo.png             | Bin 39587 -> 29908 bytes
public/bots/chatgpt-35-logo.png           | Bin 21937 -> 12916 bytes
public/bots/chatgpt-35-poe-logo.png       | Bin 35600 -> 24774 bytes
public/bots/chatgpt-4-logo.png            | Bin 16545 -> 9288 bytes
public/bots/chatgpt-4-mobile-logo.png     | Bin 18232 -> 10591 bytes
public/bots/chatgpt-4-poe-logo.png        | Bin 29015 -> 20443 bytes
public/bots/claude-100k-poe-logo.png      | Bin 33800 -> 24794 bytes
public/bots/claude-3-opus-logo.png        | Bin 22933 -> 18558 bytes
public/bots/claude-3-sonnet-logo.png      | Bin 21770 -> 17375 bytes
public/bots/claude-instant-poe-logo.png   | Bin 29814 -> 21366 bytes
public/bots/claude-logo.png               | Bin 14969 -> 12316 bytes
public/bots/claude-plus-poe-logo.png      | Bin 29994 -> 22731 bytes
public/bots/claudeapi-20-logo.png         | Bin 13879 -> 9491 bytes
public/bots/claudeapi-21-logo.png         | Bin 11581 -> 8001 bytes
public/bots/claudeapi-haiku-logo.png      | Bin 13184 -> 8880 bytes
public/bots/claudeapi-instant-12-logo.png | Bin 11960 -> 8169 bytes
public/bots/claudeapi-opus-logo.png       | Bin 15035 -> 9950 bytes
public/bots/claudeapi-sonnet-logo.png     | Bin 12477 -> 8590 bytes
public/bots/codellama-hc-logo.png         | Bin 23310 -> 14472 bytes
public/bots/codellama-logo.png            | Bin 19608 -> 11535 bytes
public/bots/ernie-logo.png                | Bin 85679 -> 58762 bytes
public/bots/falcon-180b-hc-logo.png       | Bin 79467 -> 64972 bytes
public/bots/gemini-logo.png               | Bin 34500 -> 24826 bytes
public/bots/gemma-2b-it-logo.png          | Bin 388196 -> 288702 bytes
public/bots/gemma-7b-it-logo.png          | Bin 380396 -> 283507 bytes
public/bots/gpt-4-32k-poe-logo.png        | Bin 33447 -> 22793 bytes
public/bots/huggingchat-logo.png          | Bin 2772 -> 1434 bytes
public/bots/kimi-logo.png                 | Bin 4007 -> 1900 bytes
public/bots/llama-2-13b-logo.png          | Bin 17827 -> 10384 bytes
public/bots/llama-2-70b-logo.png          | Bin 18285 -> 10616 bytes
public/bots/llama-2-7b-logo.png           | Bin 16830 -> 9762 bytes
public/bots/llama-huggingchat-logo.png    | Bin 21973 -> 13538 bytes
public/bots/lmsys-logo.png                | Bin 8597 -> 3424 bytes
public/bots/mistral-logo.png              | Bin 548 -> 535 bytes
public/bots/moss-logo.png                 | Bin 38761 -> 27929 bytes
public/bots/openai-35-16k-logo.png        | Bin 17498 -> 8502 bytes
public/bots/openai-35-logo.png            | Bin 17175 -> 8700 bytes
public/bots/openai-4-128k-logo.png        | Bin 18666 -> 9061 bytes
public/bots/openai-4-logo.png             | Bin 14149 -> 7205 bytes
public/bots/qianwen-logo.png              | Bin 21459 -> 7832 bytes
public/bots/sage-logo.png                 | Bin 18961 -> 13272 bytes
public/bots/spark-logo.png                | Bin 18731 -> 6908 bytes
public/bots/vicuna-13b-logo.png           | Bin 70495 -> 52902 bytes
public/bots/vicuna-33b-logo.png           | Bin 70244 -> 52655 bytes
public/bots/vicuna-7b-logo.png            | Bin 72831 -> 54696 bytes
public/bots/wenxin-qianfan-4-logo.png     | Bin 54058 -> 39248 bytes
public/bots/wenxin-qianfan-logo.png       | Bin 53529 -> 38543 bytes
public/bots/wenxin-qianfan-turbo-logo.png | Bin 49722 -> 36159 bytes
public/bots/wizardlm-13b-logo.png         | Bin 103330 -> 88690 bytes
public/bots/wizardlm-70b-logo.png         | Bin 102952 -> 88294 bytes
public/bots/you-logo.png                  | Bin 58820 -> 44256 bytes
public/bots/zephyr-7b-logo.png            | Bin 938 -> 443 bytes
src/assets/icon.png                       | Bin 33381 -> 21984 bytes
src/assets/logo-banner.png                | Bin 22126 -> 13928 bytes
src/assets/logo-cover.png                 | Bin 53571 -> 15961 bytes
```