update explorer readme

packages/explorer/README.md

@@ -1,32 +1,56 @@
 # World Explorer
 
 World Explorer is a GUI tool designed for visually exploring and manipulating the state of worlds.
+For the full information about it, [see the docs](http://mud.dev/world-explorer).
 
-## Getting started
+## Installation
 
-1. **Install the package**
+Starting with MUD 2.2, the MUD templates come with the World Explorer installed.
 
-   ```sh
-   pnpm add @latticexyz/explorer
-   ```
+These instructions are how to use World Explorer on earlier versions of MUD.
 
-2. **Start a local development chain**
+The easiest way to get World Explorer for earlier MUD versions is to create a project with the new template.
 
-   Ensure you have a local development chain running.
+1. Create a project with the new template, which has World Explorer. Then, delete the files you no longer need.
 
-3. **Run the World Explorer**
+   ```sh copy
+   pnpm create mud@main explorer --template vanilla
+   cd explorer
+   rm -rf packages/client packages/contracts/[st]*
+   ```
 
-   ```sh
-   npx @latticexyz/explorer --worldAddress <YOUR_WORLD_ADDRESS>
+2. Edit `mprocs.yaml` to remove the definitions for `client`, `contracts`, and `anvil`.
+
+   ```yaml filename="mprocs.yaml" copy
+   procs:
+     indexer:
+       cwd: packages/contracts
+       shell: rimraf $SQLITE_FILENAME && pnpm sqlite-indexer
+       env:
+         RPC_HTTP_URL: "http://127.0.0.1:8545"
+         FOLLOW_BLOCK_TAG: "latest"
+         SQLITE_FILENAME: "indexer.db"
+     explorer:
+       cwd: packages/contracts
+       shell: pnpm explorer
    ```
 
-   Alternatively, if you have a worlds configuration file:
+3. Replace `packages/contracts/worlds.json` with a link to the original project's `worlds.json`.
 
-   ```sh
-   npx @latticexyz/explorer --worldsConfigPath <PATH_TO_WORLDS_CONFIG>
+   ```sh copy
+   cp packages/contracts
+   rm worlds.json
+   ln -s <the original project>/packages/contracts/worlds.json .
+   cd ../..
    ```
 
-   Note: You can use `@latticexyz/store-indexer` for indexing your world's data.
+4. Run the new project.
+
+   ```sh copy
+   pnpm dev
+   ```
+
+5. Browse to [World Explorer](http://localhost:13690).
 
 ## CLI arguments
 
@@ -35,45 +59,27 @@ The World Explorer accepts the following CLI arguments:
 | Argument          | Description                                                                      | Default value |
 | ----------------- | -------------------------------------------------------------------------------- | ------------- |
 | `worldAddress`    | The address of the world to explore                                              | None          |
-| `worldsFile`      | Path to a worlds configuration file (used to resolve world address)              | None          |
+| `worldsFile`      | Path to a worlds configuration file (used to resolve world address)              | "worlds.json" |
 | `indexerDatabase` | Path to your SQLite indexer database                                             | "indexer.db"  |
 | `chainId`         | The chain ID of the network                                                      | 31337         |
 | `port`            | The port on which to run the World Explorer                                      | 13690         |
 | `env`             | The environment to run the World Explorer in (e.g., "development", "production") | "production"  |
 
-## Example setup
-
-An example setup is provided in the `examples/local-explorer` directory, demonstrating a full setup for using the World Explorer in a local development environment:
-
-1. **Setup**
-
-   ```sh
-   cd examples/local-explorer && pnpm install
-   ```
-
-2. **Run**
-
-   ```sh
-   pnpm dev
-   ```
-
-   This command starts all necessary processes, including a local chain, indexer, and the explorer.
-
 ## Contributing
 
-To contribute to or modify the World Explorer, the easiest way is to run the example setup in `development` mode:
+To contribute to World Explorer, first follow the [MUD contribution guidelines](https://mud.dev/contribute). The best way to edit the World Explorer is to run the example setup in `development` mode:
 
 1. **Setup**
 
    Navigate to the `examples/local-explorer` directory and locate the `mprocs.yaml` file.
 
 2. **Configure**
 
-   In `mprocs.yaml`, ensure the `explorer` command is set up correctly. For example:
+   In `mprocs.yaml`, ensure the `explorer` command is set to run the World Explorer in `development` mode.
 
    ```yaml
    explorer:
-     shell: pnpm explorer --worldsConfigPath packages/contracts/worlds.json --env development
+     shell: pnpm explorer --env development
    ```
 
 3. **Run**