feat: add option to change the CDN for highlight.js languages (#2351)

Required due to unstable CDNJS in China

wowchemy/data/assets.toml

@@ -73,6 +73,11 @@
   sri = "sha512-gttPT9uTUiaLBj6XZdcB0ydKXiDaBwstInkN4Qvp1Nz3iwXNc8TTQplIEPIGxyJBDqERjwkKxf2OyO47/0EHbQ=="
   url = "https://cdnjs.cloudflare.com/ajax/libs/plotly.js/%s/plotly.min.js"
 
+[js.highlight_lang]
+  version = "10.2.0"
+  sri = ""  # No SRI as highlight language styles is determined at run time.
+  url = "https://cdnjs.cloudflare.com/ajax/libs/highlight.js/%s/languages/%s.min.js"
+
 # CSS
 
 [css.fontAwesome]

wowchemy/layouts/partials/site_js.html

@@ -26,8 +26,9 @@
       {{ if $.Scratch.Get "highlight_enabled" }}
         {{ $v := $js.highlight.version }}
         {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.highlight.url $v) $js.highlight.sri | safeHTML }}
+        {{ $v := $js.highlight_lang.version }}
         {{ range site.Params.highlight_languages }}
-        <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/{{ $v }}/languages/{{ . }}.min.js"></script>
+        {{ printf "<script src=\"%s\" crossorigin=\"anonymous\"></script>" (printf $js.highlight_lang.url $v .) | safeHTML }}
         {{ end }}
       {{ end }}