docs: update README.md (#1327)

apps/web/README.md

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+# AFFiNE Web
+
+This is the web application for AFFiNE. It is a React application that uses the [Next.js](https://nextjs.org/) framework.
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+pnpm run dev
+```
+
+Open [http://localhost:8080](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `src/pages/workspace/[workspaceId]/all.tsx`. The page auto-updates as you edit the file.
+
+For more information on Next.js, take a look at the [Next.js Documentation](https://nextjs.org/docs).
+
+## Build Presets
+
+`preset.config.mjs` contains the build presets for the application. The presets are used to configure the build process for different environments. The presets are:
+
+- `enableIndexedDBProvider`: Enables the IndexedDB provider for the application. This is used to store data in the browser.
+- `enableBroadCastChannelProvider`: Enables the Broadcast Channel provider for the application. This is used to communicate between local browser tabs.
+- `prefetchWorkspace`: **deprecated**
+- `exposeInternal`: Exposes internal variables into `globalThis` for debugging purposes.
+- `enableDebugPage`: Enables the debug page for the application. This is used for debugging purposes.
+
+## BlockSuite Integration
+
+Set `LOCAL_BLOCK_SUITE=/path/to/blocksuite` to use a local version of [BlockSuite](https://github.com/toeverything/blocksuite). This is useful for development.