Use server side Katex rendering using jektex

Gemfile

@@ -4,4 +4,5 @@ gem "jekyll", "~> 4.2.0"
 
 group :jekyll_plugins do
   gem "jekyll-feed", "~> 0.12"
+  gem "jektex", "~> 0.1.1"
 end

_config.yml

@@ -30,3 +30,12 @@ comments:
 
 plugins:
  - jekyll-feed
+ - jektex
+
+jektex:
+  cache_dir: ".jektex-cache"
+  ignore: ["*.xml"]
+  silent: false
+  macros:
+    - ["\\Q", "\\mathbb{Q}"]
+    - ["\\C", "\\mathbb{C}"]

_layouts/default.html

@@ -14,8 +14,6 @@
 {% if site.plugins contains "jekyll-feed" %}<link rel="alternate" href="{{ site.feed.path | default: "/feed.xml" | relative_url }}" type="application/atom+xml" title="{{ site.title }}">{% endif %}
 {% if page.mathjax or site.mathjax %}
 <link rel="stylesheet" href="{{ "/assets/katex/katex.min.css" | relative_url }}">
-<script defer src="{{ "/assets/katex/katex.min.js" | relative_url }}"></script>
-<script defer src="{{ "/assets/katex/contrib/auto-render.min.js" | relative_url }}" onload="renderMathInElement(document.body)"></script>
 {% endif %}
 {% if site.comments.disqus_shortname and page.layout == "post" %}<script src="//{{ site.comments.disqus_shortname }}.disqus.com/embed.js" async></script>{% endif %}
 {% if site.comments.isso_domain and page.layout == "post" %}<script data-isso="http://{{ site.comments.isso_domain }}" src="//{{ site.comments.isso_domain }}/js/embed.min.js"></script>{% endif %}