Added missing content in navigation section #815 (#816)

Author: Himanshu-Mishr

README.md

@@ -10,14 +10,24 @@ Parse Dashboard is a standalone dashboard for managing your Parse apps. You can
 * [Getting Started](#getting-started)
 * [Local Installation](#local-installation)
   * [Configuring Parse Dashboard](#configuring-parse-dashboard)
+    * [File](#file)
+    * [Environment variables](#environment-variables)
+      * [Multiple apps](#multiple-apps)
+      * [Single app](#single-app)
   * [Managing Multiple Apps](#managing-multiple-apps)
+  * [App Icon Configuration](#app-icon-configuration)
   * [Other Configuration Options](#other-configuration-options)
 * [Running as Express Middleware](#running-as-express-middleware)
 * [Deploying Parse Dashboard](#deploying-parse-dashboard)
   * [Preparing for Deployment](#preparing-for-deployment)
   * [Security Considerations](#security-considerations)
     * [Configuring Basic Authentication](#configuring-basic-authentication)
     * [Separating App Access Based on User Identity](#separating-app-access-based-on-user-identity)
+  * [Use Read-Only masterKey](#use-read-only-masterKey)
+    * [Making an app read-only for all users](#making-an-app-read-only-for-all-users)
+    * [Makings users read-only](#makings-users-read-only)
+    * [Making user's apps readOnly](#making-users-apps-readonly)
+  * [Configuring Localized Push Notifications](#configuring-localized-push-notifications)
   * [Run with Docker](#run-with-docker)
 * [Contributing](#contributing)