chore: remove extra_javascript

Author: kozistr

mkdocs.yml

@@ -28,7 +28,3 @@ markdown_extensions:
       generic: true
   - markdown_include.include:
       base_path: .
-
-extra_javascript:
-  - https://polyfill.io/v3/polyfill.min.js?features=es6
-  - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js