docs: remove manual installation

Author: ishaksebsib

apps/docs/content/docs/(get-started)/installation.mdx

@@ -2,22 +2,14 @@
 title: Installation
 ---
 
-### Quick Start
+## Installation
+
 To add the AISDK, you can use the following command:
 
 ```bash
 cargo add aisdk
 ```
 
-### Manual Installation
-
-To add aisdk manually, you can add it to your `Cargo.toml` file:
-
-```toml
-[dependencies]
-aisdk = "0.1.0"
-```
-
 This will add aisdk to your project's dependencies.
 
 ## Feature Flags