recommend gh skill to install skills file

Author: skarim

README.md

@@ -21,7 +21,7 @@ Requires the [GitHub CLI](https://cli.github.com/) (`gh`) v2.0+.
 Install the gh-stack skill so your AI coding agent knows how to work with stacked PRs and the `gh stack` CLI:
 
 ```sh
-npx skills add github/gh-stack
+gh skill install github/gh-stack
 ```
 
 ## Quick start

docs/src/content/docs/getting-started/quick-start.md

@@ -23,6 +23,12 @@ gh extension install github/gh-stack
 
 If you use AI coding agents (like GitHub Copilot), install the gh-stack skill so they know how to work with Stacked PRs:
 
+```sh
+gh skill install github/gh-stack
+```
+
+Or if you prefer to use `npx skills`:
+
 ```sh
 npx skills add github/gh-stack
 ```

docs/src/content/docs/guides/workflows.md

@@ -191,6 +191,12 @@ The `unstack` command deletes the stack on GitHub first, then removes local trac
 
 AI coding agents (like GitHub Copilot) can create and manage Stacked PRs on your behalf. Install the gh-stack skill to give them the context they need:
 
+```sh
+gh skill install github/gh-stack
+```
+
+Or if you prefer to use `npx skills`:
+
 ```sh
 npx skills add github/gh-stack
 ```

docs/src/content/docs/index.mdx

@@ -31,7 +31,7 @@ import stackNavigator from '../../assets/screenshots/stack-navigator.png';
     The `gh stack` CLI makes it easy to create stacks, perform cascading rebases, push branches and create PRs, and navigate between layers — all from your terminal.
   </Card>
   <Card title="AI Agent Integration" icon="puzzle">
-    Run `npx skills add github/gh-stack` to teach your AI coding agents how to work with stacks. Break up a large diff into a stack or develop with stacks from the start.
+    Run `gh skill install github/gh-stack` to teach your AI coding agents how to work with stacks. Break up a large diff into a stack or develop with stacks from the start.
   </Card>
 </CardGrid>