IBX-9609: Strict validation (#347)

* mkdocs.yml: Stricter validation

Author: adriendupuis

mkdocs.yml

@@ -4,6 +4,14 @@ site_name: User Documentation
 repo_url: https://github.com/ezsystems/user-documentation
 site_url: https://doc.ibexa.co/projects/userguide/en/latest/
 copyright: "Copyright 1999-2024 Ibexa AS and others"
+validation:
+    omitted_files: warn
+    absolute_links: warn
+    unrecognized_links: warn
+    anchors: warn
+not_in_nav: |
+    search_results.md
+    /snippets/*
 nav:
     - Ibexa User Documentation: index.md
     - Getting started: