📝 Update changelog and config files

CHANGELOG.md

@@ -1,5 +1,3 @@
-# Changelog
-
 ## 📅 2025
 
 ### June 10
@@ -1556,4 +1554,4 @@
 - `██░░░` **Chapter 5: AI Workflow**: The images folder was reorganized with subfolders based on file type, and all files were restructured into a new folder system
 - `██░░░` **Chapter 18: Robust AI**: The files have been reorganized into a folder structure
 
-</details>
+</details>

book/config/_quarto-html.yml

@@ -107,7 +107,7 @@ website:
       title: "Main Content"
       style: "floating"
       background: light
-      collapse-level: 2
+      collapse-level: 3
       contents:
       # <!------------------------------------------------->
       # <!-- Frontmatter -->

book/contents/frontmatter/changelog/changelog.qmd

@@ -2,6 +2,10 @@
 
 This Machine Learning Systems textbook is constantly evolving. This changelog automatically records all updates and improvements, helping you stay informed about what's new and refined.
 
+::: {.callout-note title="Automated Changelog"}
+These changelog entries are automatically generated from our development process and should be mostly accurate. They track code changes, content updates, and improvements across the entire book. While the entries are comprehensive, they may occasionally contain minor inaccuracies or overly technical details.
+:::
+
 ::: {.content-visible when-format="html"}
 {{< include ../../../../CHANGELOG.md >}}
 :::