feat: add more content and fix issues

fix: hide lang switch if site is not multilingual

docs: update getting started page

fix: ordered list style

chore: update hugo icon

feat: add icon shortcode page

docs: add markdown and configuration pages

docs: add diagrams page

docs: add more content

fix: mermaid background and add image styling

chore: update templates

chore: update hugo stats

layouts/_default/_markup/render-image.html

@@ -0,0 +1,8 @@
+{{- if .Title -}}
+  <figure>
+    <img src="{{ .Destination | safeURL }}" title="{{ .Title }}" alt="{{ .PlainText | safeHTML }}" loading="lazy" />
+    <figcaption>{{ .Title }}</figcaption>
+  </figure>
+{{- else -}}
+  <img src="{{ .Destination | safeURL }}" alt="{{ .PlainText | safeHTML }}" loading="lazy" />
+{{- end -}}