chore: update install link (#2146)

### What
- updates install instructions link

| Before | After |
|--------|--------|
| <img width="1293" height="775" alt="image"
src="https://github.com/user-attachments/assets/f30738c1-94a9-49b1-b0ce-1afc19739970"
/> | <img width="1293" height="775" alt="image"
src="https://github.com/user-attachments/assets/308f5473-e931-4745-a436-d53c019a4223"
/> |

Author: trevor-trinh

README.md

@@ -2,7 +2,7 @@
 
 [![Telegram Chat][tg-badge]][tg-url] [![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/openvm-org/openvm)
 
-[**Install**](https://book.openvm.dev/getting-started/install.html)
+[**Install**](https://book.openvm.dev/getting-started/install)
 | [Book](https://book.openvm.dev)
 | [Contributor Docs](./docs)
 | [Rustdocs](https://docs.openvm.dev/openvm)