chore: add redirect

Author: mandrasch

public/.htaccess

@@ -29,3 +29,8 @@ RewriteRule ^([0-9]{4})/(.*)$ /blog/$1/$2 [R=301,L]
 # 2) Old category URLs: /blog/cat/slug → /blog/kategorie/slug
 # ------------------------------------
 RewriteRule ^blog/cat/(.*)$ /blog/kategorie/$1 [R=301,L]
+
+# ------------------------------------
+# 3) Old Impressum URL: /blog/impressum-datenschutz/ → /impressum-datenschutz/
+# ------------------------------------
+RewriteRule ^blog/impressum-datenschutz/?$ /impressum-datenschutz/ [R=301,L]