Update mkdocs.yml

mkdocs.yml

 site_name: TTOW0211 - Basics of Game Development
 site_url: http://gamedev_module.pages.labranet.jamk.fi/ttow0211-basics-of-game-development/
-
-site_author: JAMK IT
+site_description: Basics of Game Development
+site_author: Paavo Nelimarkka / JAMK IT
 
 docs_dir: materials
 site_dir: public
+
 markdown_extensions:
+    - plantuml_markdown:
+        server: http://plantuml.com/plantuml
     - toc:
-        anchorlink: True
-        separator: "_"
+        baselevel: 1
     - admonition
     - tables
     - sane_lists
-    
+    - codehilite
+    - pymdownx.superfences
+    - pymdownx.critic:
+        mode: view
+    - lightgallery
+ 
 theme:
     name: 'material'
     palette: