fix: attempt to ensure that mermaid works both in dev and preview envs

Author: SayakMukhopadhyay

layouts/partials/hooks/head-end.html

@@ -25,16 +25,6 @@
   {{- end -}}
 {{- end -}}
 
-{{ if .HasShortcode "mermaid" }}
-  <!-- Copied from https://unpkg.com/[email protected]/dist/mermaid.min.js -->
-  {{- with resources.Get "js/mermaid-10.6.1.min.js" -}}
-  <script src="{{ .RelPermalink }}" integrity="sha384-toDgDinNQVuBBJdT9Q9AnvM4szGg0g7BSEy/yLPRkkQylpeePcz8Mx/JLOFf33o+"></script>
-  {{- else -}}
-    <!-- without Mermaid, the site won't appear right -->
-    {{- errorf "No Mermaid helper script found" -}}
-  {{- end -}}
-{{- end -}}
-
 {{- if eq .Layout "glossary" -}}
   {{- with resources.Get "js/glossary.js" -}}
   <script defer src="{{ .RelPermalink }}"></script>

layouts/partials/scripts.html

@@ -1,14 +1,23 @@
 <script src="{{ "js/script.js" | relURL }}"></script>
 
+{{/* Handle legacy Kubernetes shortcode for Mermaid diagrams */}}
+{{- if (.HasShortcode "mermaid") -}}
+{{ .Page.Store.Set "hasmermaid" true -}}
+{{- end -}}
+
+{{/* future Docsy versions move this to partials/mermaid.html */}}
+{{- if .Page.Store.Get "hasmermaid" -}}
+<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/mermaid.min.js" integrity="sha512-IX+bU+wShHqfqaMHLMrtwi4nK6W/Z+QdZoL4kPNtRxI2wCLyHPMAdl3a43Fv1Foqv4AP+aiW6hg1dcrTt3xc+Q==" crossorigin="anonymous"></script>
+{{- end }}
+
 {{ $jsBs := resources.Get "vendor/bootstrap/dist/js/bootstrap.bundle.js" -}}
 {{ $jsBase := resources.Get "js/base.js" }}
 {{ $jsAnchor := resources.Get "js/anchor.js" }}
 {{ $jsSearch := resources.Get "js/search.js" | resources.ExecuteAsTemplate "js/search.js" .Site.Home }}
-{{ $jsMermaid := resources.Get "js/mermaid.js" | resources.ExecuteAsTemplate "js/mermaid.js" . }}
 {{ if .Site.Params.offlineSearch }}
 {{ $jsSearch = resources.Get "js/offline-search.js" }}
 {{ end }}
-{{ $js := (slice $jsBs $jsBase $jsAnchor $jsSearch $jsMermaid) | resources.Concat "js/main.js" -}}
+{{ $js := (slice $jsBs $jsBase $jsAnchor $jsSearch) | resources.Concat "js/main.js" -}}
 {{ if hugo.IsProduction -}}
   {{ $js := $js | minify | fingerprint -}}
   <script src="{{ $js.RelPermalink }}" integrity="{{ $js.Data.Integrity }}" crossorigin="anonymous"></script>