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/config.yml

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+backend:
+  name: gitea
+  repo: William/williammiceli.me
+  base_url: https://gitea.williammiceli.systems
+  api_root: https://gitea.williammiceli.systems/api/v1
+media_folder: static/uploads
+public_folder: /uploads
+collections:
+  - name: profile
+    label: Profile
+    files:
+      - name: profile
+        label: Profile
+        file: data/profile.yaml
+        fields:
+          - { name: name, label: Name, widget: string }
+          - { name: tagline, label: Tagline, widget: string, required: false }
+          - { name: initials, label: Initials, widget: string, required: false, hint: Shown when no avatar is set }
+          - { name: avatar, label: Avatar, widget: image, required: false }
+          - name: links
+            label: Links
+            widget: list
+            fields:
+              - { name: label, label: Label, widget: string }
+              - { name: url, label: URL, widget: string }
+              - name: icon
+                label: Icon
+                widget: select
+                default: link-45deg
+                options:
+                  - link-45deg
+                  - envelope
+                  - telephone
+                  - globe2
+                  - github
+                  - gitlab
+                  - git
+                  - linkedin
+                  - twitter-x
+                  - instagram
+                  - facebook
+                  - youtube
+                  - telegram
+                  - whatsapp
+                  - mastodon
+                  - bluesky
+                  - rss

static/admin/index.html

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+<!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>

static/favicon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="7" fill="#111318"/>
+  <g transform="scale(2)" fill="#ffffff"><path d="M4.715 6.542 3.343 7.914a3 3 0 1 0 4.243 4.243l1.828-1.829A3 3 0 0 0 8.586 5.5L8 6.086a1 1 0 0 0-.154.199 2 2 0 0 1 .861 3.337L6.88 11.45a2 2 0 1 1-2.83-2.83l.793-.792a4 4 0 0 1-.128-1.287z"/></g>
+</svg>