feat(mkdocs): Add new features and markdown extensions

This commit enhances the configuration of the MkDocs site by adding new
features and markdown extensions:
- Added features to the material theme for navigation and code copying
- Included pymdownx.highlight with anchor line numbers
- Added pymdownx.superfences and pymdownx.inlinehilite for improved formatting and highlighting

These changes were made to improve the overall user experience and provide
additional functionalities for better navigation and code display on the site.

mkdocs/mkdocs.yml

@@ -1,3 +1,12 @@
 site_name: Deta Clojure API
 theme:
   name: material
+  features:
+    - navigation.sections
+    - navigation.path
+    - content.code.copy
+markdown_extensions:
+  - pymdownx.highlight:
+      anchor_linenums: true
+  - pymdownx.superfences
+  - pymdownx.inlinehilite