message: [examples] Fix 'How to live-edit an example locally' section by adding deps installation
diff: @@ -18,8 +18,9 @@ Since each example declares `"sigma": "latest"` in its dependencies, if you want
  Our solution to this problem is that you can run an example from this directory:
  1. Open a terminal in this examples listing directory: `cd path/to/sigma/examples`
  -2. Run `npm start --example=my-example`, with `my-example` being the name of an example subdirectory
  -3. Open [localhost:3000](http://localhost:3000/) in your browser
  +2. Run `npm install` to install examples dependencies
  +3. Run `npm start --example=my-example`, with `my-example` being the name of an example subdirectory
  +4. Open [localhost:3000](http://localhost:3000/) in your browser
  You should see the example live, using local sigma sources.
  