News categories to tags

From https://gitlab.hzdr.de/hifis/overall/hifis.net/-/issues/327#note_1412618

• Single category only for (hopefully) all posts, additional stuff moved to tags
  • This basically fixes the multi-category problem introduced in https://gitlab.hzdr.de/hifis/overall/hifis.net/-/merge_requests/514/diffs
• redirects from weird multi-category urls that may be in the landscape meanwhile
• Replace static links in new posts with jekyll auto-generated ones

Closes #327 (closed)

_posts/2021/08/2021-08-20-support-punch4nfdi.md

@@ -7,6 +7,7 @@ authors:
   - "Marcus Hardt"
   - "Uwe Jandt"
 layout: blogpost
+redirect_from: news/use%20case/2021/08/20/support-punch4nfdi.html
 categories:
   - News
 excerpt: >