fix astro code

Author: pilcrowonpaper

pages/tutorials/github-oauth/astro.md

@@ -46,7 +46,6 @@ Initialize the GitHub provider with the client ID and secret.
 
 ```ts
 import { GitHub } from "arctic";
-import { GITHUB_CLIENT_ID, GITHUB_CLIENT_SECRET } from "$env/static/private";
 
 export const github = new GitHub(import.meta.env.GITHUB_CLIENT_ID, import.meta.env.GITHUB_CLIENT_SECRET, null);
 ```