doc update structure

mkdocs.yml

@@ -9,13 +9,14 @@ theme:
     collapse_navigation: false
 use_directory_urls: true
 nav:
-  - Home: 'README.md'
   - Installation: 'installation.md'
+  - 'Repository setup': 'repository-setup.md'
   - Usage: 'usage.md'
   - Config: 'config.md'
+  - 'Config format': 'config-format.md'
+  - 'Config details': 'config-details.md'
   - Templating: 'templating.md'
   - HowTo: 'howto/README.md'
-  - Contributing: 'contributing.md'
 markdown_extensions:
   - meta
   - tables