Migrate WordPress site to Hugo

Replaces the WordPress 7.0.2 / HitMag site with a static Hugo build,
deployed by Gitea Actions over rsync/SSH.

Content: 26 files (9 pages + 17 posts) as Markdown page bundles, plus
127 of 165 media attachments. The remaining 38 are media-library
leftovers that appear nowhere on the live site; they are listed in
MIGRATION.md.

The WXR export contains neither media binaries nor widgets, so both were
recovered from the live host before it is retired:
  - tools/fetch_media.py downloads all uploads, capping them at 2000px
  - tools/build_data.py scrapes the "Unsere Mitglieder" and
    "In Erinnerung" widgets into data/*.yaml

TablePress' six Termine tables became data/termine.yaml, rendered with
the newest year expanded and earlier years collapsed. Old permalinks are
not preserved (clean slugs, no redirects, as agreed).

Custom layouts, no third-party theme. Plain CSS, since the pinned Hugo
0.164.0 is the non-extended build and cannot compile Sass.

Verified: clean build with zero warnings, 718 internal links checked and
none broken, no surviving wp-content URLs.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

layouts/page.html

@@ -0,0 +1,26 @@
+{{ define "main" }}
+  <article class="page">
+    <header class="page-header">
+      <h1>{{ .Title }}</h1>
+      {{ if eq .Section "aktuelles" }}
+        <p class="page-meta">
+          <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date | time.Format site.Params.dateFormat }}</time>
+          {{ with .Params.tags }}
+            <span class="tags">{{ range . }}<span class="tag">{{ . }}</span>{{ end }}</span>
+          {{ end }}
+        </p>
+      {{ end }}
+    </header>
+
+    <div class="prose">
+      {{ .Content }}
+    </div>
+
+    {{ if eq .Section "aktuelles" }}
+      <nav class="post-nav" aria-label="Weitere Beiträge">
+        {{ with .PrevInSection }}<a class="prev" href="{{ .RelPermalink }}">← {{ .Title }}</a>{{ end }}
+        {{ with .NextInSection }}<a class="next" href="{{ .RelPermalink }}">{{ .Title }} →</a>{{ end }}
+      </nav>
+    {{ end }}
+  </article>
+{{ end }}