docs: added architecture documentation (#9256)

* docs: added architecture documentation

* update diagrams and text

* address PR comments

* sidebar + overview fixes

www/apps/book/sidebar.mjs

@@ -190,6 +190,18 @@ export const sidebar = numberSidebarItems(
       title: "Advanced Development",
       chapterTitle: "Advanced",
       children: [
+        {
+          type: "link",
+          title: "Architecture",
+          path: "/advanced-development/architecture/overview",
+          children: [
+            {
+              type: "link",
+              path: "/advanced-development/architecture/architectural-modules",
+              title: "Architectural Modules",
+            },
+          ],
+        },
         {
           type: "link",
           title: "API Routes",
@@ -485,11 +497,6 @@ export const sidebar = numberSidebarItems(
         },
       ],
     },
-    {
-      type: "link",
-      path: "/architectural-modules",
-      title: "Architectural Modules",
-    },
     {
       type: "link",
       path: "/debugging-and-testing",