[docs] code highlighting configuration (#1817)

Co-authored-by: decentral1se <cellarspoon@riseup.net>

mkdocs.yml

@@ -36,6 +36,13 @@ extra_css:
 
 markdown_extensions:
   - admonition
+  - pymdownx.highlight:
+      anchor_linenums: true
+      line_spans: __span
+      pygments_lang_class: true
+  - pymdownx.inlinehilite
+  - pymdownx.snippets
+  - pymdownx.superfences
 
 nav:
   - "Home": "index.md"