Restructure book chapters.

doc/src/SUMMARY.md

@@ -26,15 +26,14 @@ The Rhai Scripting Language
    4. [Create a Rust Closure from a Rhai Function](engine/func.md)
    5. [Evaluate Expressions Only](engine/expressions.md)
    6. [Raw Engine](engine/raw.md)
+   7. [Scope - Initializing and Maintaining State](engine/scope.md)
+   8. [Engine Configuration Options](engine/options.md)
 4. [Extend Rhai with Rust](rust/index.md)
    1. [Traits](rust/traits.md)
    2. [Register a Rust Function](rust/functions.md)
       1. [String Parameters in Rust Functions](rust/strings.md)
    3. [Register a Generic Rust Function](rust/generic.md)
    4. [Register a Fallible Rust Function](rust/fallible.md)
-   5. [Packages](rust/packages/index.md)
-      1. [Built-in Packages](rust/packages/builtin.md)
-      2. [Create a Custom Package](rust/packages/create.md)
    6. [Override a Built-in Function](rust/override.md)
    7. [Operator Overloading](rust/operators.md)
    8. [Register a Custom Type and its Methods](rust/custom.md)
@@ -42,8 +41,9 @@ The Rhai Scripting Language
       2. [Indexers](rust/indexers.md)
       3. [Disable Custom Types](rust/disable-custom.md)
       4. [Printing Custom Types](rust/print-custom.md)
-   9. [Scope - Initializing and Maintaining State](rust/scope.md)
-   10. [Engine Configuration Options](rust/options.md)
+   9. [Packages](rust/packages/index.md)
+      1. [Built-in Packages](rust/packages/builtin.md)
+      2. [Create a Custom Package](rust/packages/create.md)
 5. [Rhai Language Reference](language/index.md)
    1. [Comments](language/comments.md)
    2. [Values and Types](language/values-and-types.md)

doc/src/links.md

@@ -33,7 +33,7 @@
 [packages]: {{rootUrl}}/rust/packages/index.md
 [custom package]: {{rootUrl}}/rust/packages/create.md
 [custom packages]: {{rootUrl}}/rust/packages/create.md
-[`Scope`]: {{rootUrl}}/rust/scope.md
+[`Scope`]: {{rootUrl}}/engine/scope.md
 [`serde`]: {{rootUrl}}/rust/serde.md
 
 [`type_of()`]: {{rootUrl}}/language/type-of.md