Track 2 files into repository.

- modified book.json
- untracked layouts/footer.html

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 {
+  "language": "zh-hans",
   "plugins": [
     "-sharing",
-    "tbfed-pagefooter"
+    "-page-treeview",
+    "-footer",
+    "-tbfed-pagefooter"
   ],
-  "pluginsConfig": {
+  ".pluginsConfig": {
+    "layout": {
+      "footerPath": "layouts/footer.html"
+    },
     "tbfed-pagefooter": {
       "copyright": "&copy Taobao FED Team",
       "modify_label": "该文件修订时间：",

+footer.html