Add content-generic layout and cookbook

.docs/Changelog.11tydata.json

@@ -1,5 +1,5 @@
 {
-	"layout": "theme.njk",
+	"layout": "content-generic.njk",
 	"title": "Changelog",
 	"tags": "navigable",
 	"date": "2002-01-01"

.docs/Cookbook.11tydata.json

@@ -0,0 +1,6 @@
+{
+	"layout": "content-generic.njk",
+	"title": "Cookbook",
+	"tags": "navigable",
+	"date": "2002-01-01"
+}

.docs/Cookbook.md

@@ -0,0 +1 @@
+../Cookbook.md

.docs/_includes/content-generic.njk

@@ -0,0 +1,7 @@
+---
+layout: theme.njk
+---
+
+<main class="panel-generic">
+	{{ content | safe }}
+</main>

.docs/_includes/theme.njk

@@ -24,6 +24,7 @@
 				<li><a href="https://github.com/sbrl/Minetest-WorldEditAdditions/" class="nav image"><img src="{% image_urlpass 'images/github.svg' %}" alt="GitHub" title="GitHub" /></a></li>
 			</ul>
 		</nav>
+		
 		{{ content | safe }}
 		
 		<footer class="shadow-top">