kamailio-kemi-framework: replaced pages with nav in yml config

kamailio-kemi-framework/mkdocs.yml

@@ -1,7 +1,7 @@
 site_name: Kamailio KEMI Framework
 theme: readthedocs
 extra_css: [extra.css]
-pages:
+nav:
     - 'Kamailio KEMI Framework': 'index.md'
     - 'KEMI Interpreters': 'kemi.md'
     - 'Core And PV Functions': 'core.md'
@@ -11,4 +11,4 @@ pages:
     - 'Contributions': 'contributions.md'
 markdown_extensions:
     - toc:
-        permalink: Link
+        permalink: Link