feat: support breadcrumbs for single pages that are neither docs or blogs (#743)

* feat: support breadcrumbs for single pages that are neither docs or blogs.

* feat: support enabling breadcrumbs across different content types other than docs and blog

docs: added docs and examples for enabling breadcrumbs for specific content types

* feat: breadcrumbs being enabled is fully driven by the `breadcrumbs` front matter field.

docs: updated docs to reflect that there is no site parameter driving breadcrumbs

feat: enabled breadcrumbs for lists as well as singles for uniformity

* Removing _partials/utils/default-breadcrumbs-enabled.html in favour of extra parameterization of _partials/breadcrumb.html

* fix: change breadcrumbs parameter from `enabledByDefault` to `enable` to remain consistent with the rest of the theme

* Update layouts/_partials/breadcrumb.html

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Co-authored-by: Xin <5097752+imfing@users.noreply.github.com>

layouts/single.html

@@ -4,6 +4,7 @@
     {{ partial "toc.html" . }}
     <article class="hx:w-full hx:break-words hx:flex hx:min-h-[calc(100vh-var(--navbar-height))] hx:min-w-0 hx:justify-center hx:pb-8 hx:pr-[calc(env(safe-area-inset-right)-1.5rem)]">
       <main class="hx:w-full hx:min-w-0 hx:max-w-6xl hx:px-6 hx:pt-4 hx:md:px-12">
+        {{ partial "breadcrumb.html" (dict "page" . "enable" false) }}
         <br class="hx:mt-1.5 hx:text-sm" />
         {{ if .Title }}<h1 class="hx:text-center hx:mt-2 hx:text-4xl hx:font-bold hx:tracking-tight hx:text-slate-900 hx:dark:text-slate-100">{{ .Title }}</h1>{{ end }}
         <div class="hx:mb-16"></div>