Fix docs site links to use custom domain paths

- Remove hardcoded GitHub Pages URLs from examples links
- Update docs site base path to support custom domain
- Change mockup browser URL display to show custom domain
- Links now use relative paths that work with both local dev and custom domain

Co-Authored-By: Claude <noreply@anthropic.com>

Author: chillenious

packages/docs-site/src/lib/components/SiteHeader.svelte

@@ -4,7 +4,7 @@
 
 	// Note: docs-site is prerendered; avoid creating an internal prerender-crawled link to /examples
 	// (that path is served by a separate app, merged into the final Pages artifact).
-	const examplesHref = dev ? `${base}/examples/` : 'https://pie-framework.github.io/pie-qti/examples/';
+	const examplesHref = `${base}/examples/`;
 </script>
 
 <header class="border-b border-base-200 bg-base-100/80 backdrop-blur">

packages/docs-site/src/routes/+page.svelte

@@ -4,7 +4,7 @@
 
 	// Note: docs-site is prerendered; avoid creating an internal prerender-crawled link to /examples
 	// (that path is served by a separate app, merged into the final Pages artifact).
-	const examplesHref = dev ? `${base}/examples/` : 'https://pie-framework.github.io/pie-qti/examples/';
+	const examplesHref = `${base}/examples/`;
 </script>
 
 <svelte:head>
@@ -72,7 +72,7 @@
 				<div class="card-body">
 					<div class="mockup-browser border border-base-300 bg-base-200">
 						<div class="mockup-browser-toolbar">
-							<div class="input border border-base-300 bg-base-100">pie-framework.github.io/pie-qti/examples</div>
+							<div class="input border border-base-300 bg-base-100">qti.pie-framework.org/examples</div>
 						</div>
 						<div class="bg-base-100 p-3">
 							<img

packages/docs-site/svelte.config.js

@@ -14,7 +14,11 @@ const config = {
 			strict: false
 		}),
 		paths: {
-			base: process.env.NODE_ENV === 'production' ? '/pie-qti' : ''
+			// No base path needed for custom domain (qti.pie-framework.org)
+			// Use GITHUB_PAGES_SUBPATH env var if deploying to GitHub Pages URL
+			base: process.env.GITHUB_PAGES_SUBPATH === 'true' && process.env.NODE_ENV === 'production'
+				? '/pie-qti'
+				: ''
 		},
 		prerender: {
 			entries: ['*'],