docs: add anchors for toc topics

docs/README.md

@@ -3,10 +3,10 @@
 ### Table of contents
 
 1. [Getting Started](./intro.md)
-    - [Introduction](./intro.md)
+    - [Introduction](./intro.md#)
     - [Installation](./installation.md)
 1. [Core Concepts](./core-concepts.md)
-    - [Overview](./core-concepts.md)
+    - [Overview](./core-concepts.md#)
     - [Browser](./core-concepts.md#browser)
     - [Browser contexts](./core-concepts.md#browser-contexts)
     - [Pages and frames](./core-concepts.md#pages-and-frames)
@@ -24,7 +24,7 @@
     - [Upload files](./input.md#upload-files)
     - [Focus element](./input.md#focus-element)
 1. [Emulation](./emulation.md)
-    - [Overview](./emulation.md)
+    - [Overview](./emulation.md#)
     - [User agent](./emulation.md#user-agent)
     - [Viewport, color scheme](./emulation.md#viewport-color-scheme)
     - [Devices](./emulation.md#devices)
@@ -32,7 +32,7 @@
     - [Permissions](./emulation.md#permissions)
     - [Geolocation](./emulation.md#geolocation)
 1. [Network](./network.md)
-    - [Overview](./network.md)
+    - [Overview](./network.md#)
     - [HTTP Authentication](./network.md#http-authentication)
     - [Handle file downloads](./network.md#handle-file-downloads)
     - [Network events](./network.md#network-events)
@@ -45,7 +45,7 @@
     - [Page events](./verification.md#page-events)
     - [Handling exceptions](./verification.md#handling-exceptions)
 1. [Navigation and Loading](./loading.md)
-    - [Overview](./loading.md)
+    - [Overview](./loading.md#)
     - [Common scenarios](./loading.md#common-scenarios)
     - [Loading a popup](./loading.md#loading-a-popup)
     - [Client-side redirects](./loading.md#unusual-client-side-redirects)