Enable material theme again

mkdocs.yml

 site_name: IT4Innovations Documentation
-theme_dir: 'material'
 docs_dir: docs.it4i
 site_favicon: img/favicon.ico
 
@@ -17,6 +16,14 @@ repo_url: https://code.it4i.cz/sccs/docs.it4i.cz
 # Copyright
 copyright: Copyright (c) 2013-2018 IT4Innovations / ver. 03ecba66 / 2018-10-16 10:21:23 +0200
 
+theme:
+  name: null
+  custom_dir: material
+
+  # Don't include MkDocs' JavaScript
+  include_search_page: false
+  search_index_only: true
+
 pages:
   - Home: index.md
   - Accessing the Clusters: