docs: use plain online docs URL

Author: chenjiahan

packages/create-rstack/template-common/AGENTS.md

@@ -3,5 +3,5 @@
 This project uses Rstack CLI as its JS toolchain:
 
 - Read the docs linked from `node_modules/rstack/docs/llms.txt` when needed
-- Online docs: [https://rstack.rs/llms.txt](https://rstack.rs/llms.txt)
+- Online docs: https://rstack.rs/llms.txt
 - Run `rs -h` for CLI help

website/docs/en/guide/ai.mdx

@@ -23,7 +23,7 @@ You can also copy the following content into your own `AGENTS.md`:
 This project uses Rstack CLI as its JS toolchain:
 
 - Read the docs linked from `node_modules/rstack/docs/llms.txt` when needed
-- Online docs: [https://rstack.rs/llms.txt](https://rstack.rs/llms.txt)
+- Online docs: https://rstack.rs/llms.txt
 - Run `rs -h` for CLI help
 ```
 

website/docs/zh/guide/ai.mdx

@@ -23,7 +23,7 @@ import { PackageManagerTabs } from '@rspress/core/theme';
 This project uses Rstack CLI as its JS toolchain:
 
 - Read the docs linked from `node_modules/rstack/docs/llms.txt` when needed
-- Online docs: [https://rstack.rs/llms.txt](https://rstack.rs/llms.txt)
+- Online docs: https://rstack.rs/llms.txt
 - Run `rs -h` for CLI help
 ```