move cwd as the first argument to yarn

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

docs/getting-started/configuration.md

@@ -67,7 +67,7 @@ App. Use the following commands to start the PostgreSQL client installation:
 
 ```bash
 # From your Backstage root directory
-yarn add --cwd packages/backend pg
+yarn --cwd packages/backend add pg
 ```
 
 Use your favorite editor to open `app-config.yaml` and add your PostgreSQL

docs/getting-started/configure-app-with-plugins.md

@@ -23,7 +23,7 @@ to an entity in the software catalog.
 
    ```bash
    # From your Backstage root directory
-   yarn add --cwd packages/app @circleci/backstage-plugin
+   yarn --cwd packages/app add @circleci/backstage-plugin
    ```
 
    Note the plugin is added to the `app` package, rather than the root

docs/getting-started/homepage.md

@@ -30,7 +30,7 @@ Now, let's get started by installing the home plugin and creating a simple homep
 
 ```bash
 # From your Backstage root directory
-yarn add --cwd packages/app @backstage/plugin-home
+yarn --cwd packages/app add @backstage/plugin-home
 ```
 
 #### 2. Create a new HomePage component