Serve only VERSION_D at /static; remove LINDAT static pages (#813)

Only the deployed-version info page should be reachable. Scope the angular.json
asset to VERSION_D.html and remove the inherited LINDAT static-files set
(about/cite/faq/license pages + cs/ localized copies) so nothing else under
/static is web-accessible. A VERSION_D.html placeholder keeps the directory
present for the build-time generation.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Matus Kasak

angular.json

@@ -40,7 +40,11 @@
             "aot": true,
             "assets": [
               "src/assets",
-              "src/static-files",
+              {
+                "glob": "VERSION_D.html",
+                "input": "src/static-files",
+                "output": "static-files"
+              },
               "src/robots.txt"
             ],
             "styles": [