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

exampleSite/hugo_stats.json

@@ -11,8 +11,11 @@
       "button",
       "cite",
       "code",
+      "del",
       "div",
       "em",
+      "figcaption",
+      "figure",
       "footer",
       "g",
       "h1",
@@ -24,6 +27,7 @@
       "head",
       "hr",
       "html",
+      "img",
       "input",
       "kbd",
       "li",