Update hightlighjs (#62)

Author: Bram

.github/workflows/ci.yml

@@ -11,5 +11,5 @@ jobs:
       - uses: actions/setup-python@v2
         with:
           python-version: 3.x
-      - run: pip install -r requirements.txt
+      - run: pip install mkdocs-material 
       - run: mkdocs gh-deploy --force

mkdocs.yml

@@ -144,9 +144,9 @@ markdown_extensions:
   - pymdownx.keys: { }
 
 extra_javascript:
-  - https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.4.0/highlight.min.js
+  - https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.4.0/highlight.min.js
   - javascripts/highlight.js
 
 # Themes can be found here: <https://github.com/highlightjs/highlight.js/tree/master/src/styles>
 extra_css:
-  - https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.4.0/styles/atom-one-dark-reasonable.min.css
+  - https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.4.0/styles/atom-one-dark-reasonable.min.css