🔒️ Fix polyfill supply chain attack vulnerability

See:
- https://www.bleepingcomputer.com/news/security/polyfillio-javascript-supply-chain-attack-impacts-over-100k-sites/
- https://sansec.io/research/polyfill-supply-chain-attack

Author: ebouchut

mkdocs.yml

@@ -78,7 +78,6 @@ markdown_extensions:
         toc_depth: 3
         title: Headers on this Page
 extra_javascript:
-    - https://polyfill.io/v3/polyfill.min.js?features=es6
     - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
 
 plugins: