add log and config docs

docs/.vuepress/enhanceApp.js

@@ -10,5 +10,20 @@ export default ({
   router, // the router instance for the app
   siteData // site metadata
 }) => {
-  // ...apply enhancements for the site.
-}
+  if (typeof process === "undefined" || process.env.VUE_ENV !== "server") {
+    router.onReady(() => {
+      const { app } = router;
+      app.$once("hook:mounted", () => {
+        // temporary fix for https://github.com/vuejs/vuepress/issues/2428
+        setTimeout(() => {
+          const { hash } = document.location;
+          if (hash.length > 1) {
+            const id = hash.substring(1);
+            const element = document.getElementById(id);
+            if (element) element.scrollIntoView();
+          }
+        }, 500);
+      });
+    });
+  }
+};