feat(content): add draft support for content collections

This commit introduces a draft system for the 'events' and 'news' collections. A `draft` boolean field has been added to the content schema, and frontend queries are now updated to only fetch and
display content where `draft` is `false`. This allows content to be created and saved without being publicly visible, improving the publishing workflow.

app/assets/css/main.css

@@ -7,3 +7,7 @@
   --color-primary: #fb9e3a;
   --color-secondary: #fcef91;
 }
+
+.dark {
+  --color-gray-800: oklch(85% 0 275);
+}