Add Hugo link page with Sveltia CMS admin

Content lives in data/profile.yaml and is edited as structured fields through Sveltia at /admin/, so the page is never hand-written HTML. The CMS bundle is vendored at a pinned version instead of loaded from unpkg, and the admin assets ship with the built site, so hosting and builds stay self-contained. PKCE sign-in activates once a Gitea OAuth application client ID is added to static/admin/config.yml.

static/admin/index.html

@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <meta name="robots" content="noindex">
+  <title>Content — williammiceli.me</title>
+</head>
+<body>
+  <script src="./vendor/sveltia-cms.js"></script>
+</body>
+</html>