feat(website): improve doc side of website

website/content/docs/_index.md

@@ -1,6 +1,7 @@
 ---
 title: Introduction
 layout: doc
+weight: -1
 ---
 
 Hello!

website/content/docs/getting-started.md

@@ -0,0 +1,5 @@
+---
+title: Getting Started
+layout: doc
+weight: -10
+---

website/themes/hsh/layouts/_default/doc.html

@@ -1,9 +1,25 @@
 {{ define "main" }}
-<main>
+<div class="container mt-auto mt-auto py-3 row">
-	<div class="container">
+	<div class="container" style="width: 240px;">
+		<div class="p-3 col">
+			<ul class="nav nav-pills mb-auto">
+				{{ $currentPage := . }}
+				{{ range where site.Pages.ByWeight.Reverse "Type" "docs" }}
+					<li class="nav-item">
+						<a href="{{ .URL }}" class="nav-link">
+							{{ .Title }}
+						</a>
+					</li>
+				{{ end }}
+			</ul>
+		</div>
+	</div>
+	<div class="col">
+		<div>
 			<h1>{{ .Title }}</h1>
 			{{.Content}}
 		</div>
-</main>
+	</div>
+</div>
 {{ end }}