Rewrite Mermaid and KaTeX to be usable both from shorcode and code block, update dependencies

layouts/_shortcodes/katex.html

@@ -1,13 +1,19 @@
-{{- if not (.Page.Scratch.Get "katex") -}}
+{{- if not (.Page.Store.Get "katex") -}}
 <!-- Include katex only first time -->
 <link rel="stylesheet" href="{{ "katex/katex.min.css" | relURL }}" />
 <script defer src="{{ "katex/katex.min.js" | relURL }}"></script>
-<script defer src="{{ "katex/auto-render.min.js" | relURL }}" onload="renderMathInElement(document.body);"></script>
-{{- .Page.Scratch.Set "katex" true -}}
+{{ with resources.Get "katex.json" }}
+  <script defer src="{{ "katex/auto-render.min.js" | relURL }}" onload="renderMathInElement(document.body, {{ .Content | safeJS }});"></script>
+{{ end }}
+{{- .Page.Store.Set "katex" true -}}
 {{- end -}}
 
-<span {{- with .Get "class" }} class="{{ . }}"{{ end }}>
-  {{ with .Get "display" }}\[{{else}}\({{end}}
-  {{- .InnerDeindent -}}
-  {{ with .Get "display" }}\]{{else}}\){{end}}
+{{ if .Inner }}
+<span>
+  {{- if .Get "display" }}
+  \[ {{ .Inner }} \]
+  {{ else }}
+  \( {{ .Inner }} \)
+  {{ end -}}
 </span>
+{{ end }}