docs: update table of contents for docs sidebar (microsoft#3291)

Author: arjunattam

docs/README.md

@@ -17,84 +17,26 @@ Playwright is a library to automate [Chromium](https://www.chromium.org/Home), [
 
 ### Table of contents
 
-1. [Getting Started](./intro.md)
-    - [Installation](./intro.md#installation)
-    - [Usage](./intro.md#usage)
+1. Introduction
+    - [Getting started](./intro.md)
     - [First script](./intro.md#first-script)
-    - [System requirements](./intro.md#system-requirements)
-    - [Installation parameters](./installation.md)
-1. [Core Concepts](./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)
-    - [Selectors](./core-concepts.md#selectors)
-    - [Auto-waiting](./core-concepts.md#auto-waiting)
-    - [Execution contexts: Node.js and Browser](./core-concepts.md#execution-contexts-nodejs-and-browser)
-    - [Object & element handles](./core-concepts.md#object--element-handles)
-1. [Input](./input.md)
-    - [Text input](./input.md#text-input)
-    - [Checkboxes](./input.md#checkboxes)
-    - [Select options](./input.md#select-options)
-    - [Mouse click](./input.md#mouse-click)
-    - [Type characters](./input.md#type-characters)
-    - [Keys and shortcuts](./input.md#keys-and-shortcuts)
-    - [Upload files](./input.md#upload-files)
-    - [Focus element](./input.md#focus-element)
-1. [Emulation](./emulation.md)
-    - [Devices](./emulation.md#devices)
-    - [Overview](./emulation.md#)
-    - [User agent](./emulation.md#user-agent)
-    - [Viewport](./emulation.md#viewport)
-    - [Locale & Timezone](./emulation.md#locale--timezone)
-    - [Permissions](./emulation.md#permissions)
-    - [Geolocation](./emulation.md#geolocation)
-    - [Color scheme and media](./emulation.md#color-scheme-and-media)
-1. [Network](./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)
-    - [Handle requests](./network.md#handle-requests)
-    - [Modify requests](./network.md#modify-requests)
-    - [Abort requests](./network.md#abort-requests)
-1. [Assertions](./assertions.md)
-    - [Common patterns](./assertions.md#common-patterns)
-    - [Element Handles](./assertions.md#element-handles)
-    - [Custom assertions](./assertions.md#custom-assertions)
-1. [Debugging tools](./debug.md)
-    - [VS Code debugger](./debug.md#visual-studio-code-debugger)
-    - [Browser developer tools](./debug.md#browser-developer-tools)
-    - [Debug mode](./debug.md#run-in-debug-mode)
-1. [Verification](./verification.md)
-    - [Screenshots](./verification.md#screenshots)
-    - [Console logs](./verification.md#console-logs)
-    - [Page errors](./verification.md#page-errors)
-    - [Page events](./verification.md#page-events)
-1. [Navigation and Loading](./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)
-    - [Navigation after a timeout](./loading.md#click-triggers-navigation-after-a-timeout)
-1. [Multi-page scenarios](./multi-pages.md)
-    - [Multiple contexts](./multi-pages.md#multiple-contexts)
-    - [Multiple pages](./multi-pages.md#multiple-pages)
-    - [Handling new pages](./multi-pages.md#handling-new-pages)
-    - [Handling popups](./multi-pages.md#handling-popups)
-1. [Test runners](./test-runners.md)
-    - [Jest / Jasmine](./test-runners.md#jest--jasmine)
-    - [AVA](./test-runners.md#ava)
-    - [Mocha](./test-runners.md#mocha)
-1. [Continuous Integration](./ci.md)
-    - [Docker](./ci.md#docker)
-    - [GitHub Actions](./ci.md#github-actions)
-    - [Azure Pipelines](./ci.md#azure-pipelines)
-    - [Travis CI](./ci.md#travis-ci)
-    - [CircleCI](./ci.md#circleci)
-    - [Troubleshooting](./troubleshooting.md)
-1. [Selector engines](./selectors.md)
-1. [Actionability](./actionability.md)
-1. [Extensibility](./extensibility.md)
-    - [Custom selector engines](./extensibility.md#custom-selector-engines)
-1. [API Reference](./api.md)
+    - [Core concepts](./core-concepts.md)
+    - [Debugging](./debug.md)
+1. Guides
+    - [Selectors](./selectors.md)
+    - [Input](./input.md)
+    - [Emulation](./emulation.md)
+    - [Network](./network.md)
+    - [Assertions](./assertions.md)
+    - [Verification](./verification.md)
+    - [Navigation and Loading](./loading.md)
+    - [Multi-page scenarios](./multi-pages.md)
+1. Integrations
+    - [Test runners](./test-runners.md)
+    - [Docker](./docker/README.md)
+    - [Continuous integration](./ci.md)
+1. Reference
+    - [API Reference](./api.md)
+    - [Actionability](./actionability.md)
+    - [Advanced installation](./installation.md)
+    - [Extensibility](./extensibility.md)