Suggestion: actually use Parts to group chapters

[dbdr]

Currently, some of the book chapters have a title that says Part 1/2. In particular: "3. Part 1: Building User Interfaces" and "14. Part 2: Server Side Rendering". This seems backwards: a chapter should be inside a part, rather than the other way around.

As a beginner with leptos, I found this confusing. For instance, for my test project, I did not really care regarding client vs server side rendering. However, when I did want some (non-rendering) code to run on the server, I jumped to chapter15 (Working with the Server), and it did not work because I did not use the setup done in chapter 14. If chapter 15 had been clearly a subchapter of part "Server side rendering", the dependency might have been more clear.

Would it be possible to actually introduce real parts, and to make chapters belong to a part?