docs: remove extraneous --save and yarn install instructions (#323)

CONTRIBUTING.md

@@ -42,9 +42,7 @@ If you’d like to use the repository from source, you can either install from g
 To install via git:
 
 ```bash
-npm install --save git+ssh://[email protected]:anthropics/anthropic-sdk-typescript.git
-# or
-yarn add git+ssh://[email protected]:anthropics/anthropic-sdk-typescript.git
+npm install git+ssh://[email protected]:anthropics/anthropic-sdk-typescript.git
 ```
 
 Alternatively, to link a local copy of the repo:

README.md

@@ -9,10 +9,7 @@ The REST API documentation can be found [on docs.anthropic.com](https://docs.ant
 ## Installation
 
 ```sh
-# install from NPM
-npm install --save @anthropic-ai/sdk
-# or
-yarn add @anthropic-ai/sdk
+npm install @anthropic-ai/sdk
 ```
 
 ## Usage

packages/bedrock-sdk/README.md

@@ -9,9 +9,7 @@ For the non-Bedrock Anthropic API at api.anthropic.com, see [`@anthropic-ai/sdk`
 ## Installation
 
 ```sh
-npm install --save @anthropic-ai/bedrock-sdk
-# or
-yarn add @anthropic-ai/bedrock-sdk
+npm install @anthropic-ai/bedrock-sdk
 ```
 
 ## Usage

packages/vertex-sdk/README.md

@@ -1,6 +1,6 @@
 # Anthropic Vertex TypeScript API Library
 
-> [!IMPORTANT]  
+> [!IMPORTANT]
 > This API is in private preview.
 
 [![NPM version](https://img.shields.io/npm/v/@anthropic-ai/vertex-sdk.svg)](https://npmjs.org/package/@anthropic-ai/vertex-sdk)
@@ -12,9 +12,7 @@ For the non-Vertex Anthropic API at api.anthropic.com, see [`@anthropic-ai/sdk`]
 ## Installation
 
 ```sh
-npm install --save @anthropic-ai/vertex-sdk
-# or
-yarn add @anthropic-ai/vertex-sdk
+npm install @anthropic-ai/vertex-sdk
 ```
 
 ## Usage