chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/book/tsconfig.json

@@ -0,0 +1,24 @@
+{
+  "extends": "tsconfig/nextjs.json",
+  "compilerOptions": {
+    "paths": {
+      "@/*": [
+        "./*"
+      ]
+    },
+    "typeRoots": [
+      "../../node_modules/@types",
+      "./node_modules/@types",
+      "./types"
+    ],
+    "jsx": "preserve",
+  },
+  "include": [
+    "next-env.d.ts",
+    "**/*.tsx",
+    "**/*.ts",
+    "**/*.js",
+    ".next/types/**/*.ts",
+    "**/*.mjs"
+  ]
+}