Initial SvelteKit frontend port of windwiderstand.de

Full parity with Astro site: content rows, post/tag routes, pagination,
event badges + OSM map, comments, Live-Search via /api/search-index,
CMS image proxy, RSS, sitemap.

Deploy: Dockerfile + docker-compose.prod.yml + Gitea Actions workflow
to build + push to git.pm86.de registry and ssh-deploy to Contabo.

static/favicons/browserconfig.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+  <msapplication>
+    <tile>
+      <square70x70logo src="/favicons/ms-icon-70x70.png" />
+      <square150x150logo src="/favicons/ms-icon-150x150.png" />
+      <square310x310logo src="/favicons/ms-icon-310x310.png" />
+      <TileColor>#ffffff</TileColor>
+    </tile>
+  </msapplication>
+</browserconfig>