Update mkdocs.yml

mkdocs.yml

-site_name: mathforquantum
+site_name: Mathematics for Quantum Physics
 repo_url: https://gitlab.kwant-project.org/mathematics-for-quantum-physics/lectures
 repo_name: source
 edit_uri: edit/master/src/
@@ -22,6 +22,13 @@ theme:
     primary: 'white'
     accent: 'indigo'
 
+plugins:
+  - search
+  - mkdocs-simple-hooks:
+      hooks:
+        on_page_read_source: "execute:on_page_read_source"
+        on_page_markdown: "execute:on_page_markdown"
+
 markdown_extensions:
   - mdx_math:
       enable_dollar_delimiter: True