GitBook: Update content

Author: web-flow

docs/SUMMARY.md

@@ -258,8 +258,6 @@
     * [Gpt 5 Image](api-references/text-models-llm/openai/gpt-5-image.md)
     * [Gpt 5.2 Chat](api-references/text-models-llm/openai/gpt-5.2-chat.md)
     * [Gpt 5.3 Chat](api-references/text-models-llm/openai/gpt-5.3-chat.md)
-    * [Gpt 5.4 Image 2](api-references/text-models-llm/openai/gpt-5.4-image-2.md)
-    * [Gpt 5.4 Mini](api-references/text-models-llm/openai/gpt-5.4-mini.md)
   * [Perplexity](api-references/text-models-llm/perplexity/README.md)
     * [Sonar](api-references/text-models-llm/perplexity/sonar.md)
     * [Sonar Pro](api-references/text-models-llm/perplexity/sonar-pro.md)