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>

content/archiv/bilder-familienausfahrt/index.md

@@ -0,0 +1,9 @@
+---
+title: "Bilder Familienausfahrt"
+date: 2019-06-06T14:43:01Z
+lastmod: 2019-06-06T15:15:53Z
+---
+
+{{< gallery "20190601-160915-1.jpg" "20190601-160809-1.jpg" "whatsapp-image-2019-06-04-at-10-55-19.jpeg" "whatsapp-image-2019-06-04-at-10-54-59.jpeg" "20190602-005501.jpg" "20190601-182210.jpg" "20190601-182158.jpg" "20190601-181902.jpg" "20190601-181854.jpg" "20190601-181846.jpg" "20190601-160932.jpg" "20190601-160930.jpg" "20190601-160915.jpg" "20190601-160842.jpg" "20190601-160837.jpg" "20190601-160817.jpg" "20190601-160809.jpg" "20190601-160802.jpg" "20190601-154602.jpg" >}}
+
+![](20190602-005454.jpg)