chore: adapt theme to new template system (#696)

* Adapted theme's layout to [Hugo v0.146.0](https://gohugo.io/templates/new-templatesystem-overview/)
* Bumped minimal Hugo version to v0.146.0

layouts/_partials/components/github-style-alert.html

@@ -0,0 +1,42 @@
+{{- $content := .content -}}
+{{- $alertType := .alertType -}}
+{{- $alertTitle := .alertTitle -}}
+
+{{- $icons := dict
+  "note" "information-circle"
+  "tip" "light-bulb"
+  "important" "information-circle"
+  "warning" "exclamation"
+  "caution" "exclamation-circle"
+-}}
+
+{{- $icon := index $icons $alertType -}}
+{{- $title := or $alertTitle (or (i18n $alertType) (title $alertType)) -}}
+
+{{- $defaultClass := "hx:border-orange-100 hx:bg-orange-50 hx:text-orange-800 hx:dark:border-orange-400/30 hx:dark:bg-orange-400/20 hx:dark:text-orange-300" }}
+
+{{- $alertClasses := dict
+  "note" "hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200"
+  "tip" "hx:border-green-200 hx:bg-green-100 hx:text-green-900 hx:dark:border-green-200/30 hx:dark:bg-green-900/30 hx:dark:text-green-200"
+  "important" "hx:border-indigo-200 hx:bg-indigo-100 hx:text-indigo-900 hx:dark:border-indigo-200/30 hx:dark:bg-indigo-900/30 hx:dark:text-indigo-200"
+  "warning" "hx:border-amber-200 hx:bg-amber-100 hx:text-amber-900 hx:dark:border-amber-200/30 hx:dark:bg-amber-900/30 hx:dark:text-amber-200"
+  "caution" "hx:border-red-200 hx:bg-red-100 hx:text-red-900 hx:dark:border-red-200/30 hx:dark:bg-red-900/30 hx:dark:text-red-200"
+-}}
+
+{{- $class := index $alertClasses $alertType | default $defaultClass -}}
+
+
+<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current {{ $class }}">
+  <p class="hx:flex hx:items-center hx:font-medium">
+    {{- with $icon -}}
+      {{- partial "utils/icon.html" (dict "name" . "attributes" `height=16px class="hx:inline-block hx:align-middle hx:mr-2"`) -}}
+    {{- end -}}
+    {{- $title -}}
+  </p>
+
+  <div class="hx:w-full hx:min-w-0 hx:leading-7">
+    <div class="hx:mt-6 hx:leading-7 hx:first:mt-0">
+      {{- $content -}}
+    </div>
+  </div>
+</div>