fix descriptions

Author: zkat

src/_includes/base.html

@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta
       name="description"
-      content="This is the KDL playground: try out KDL documents and see the resulting structure!"
+      content="kdl is a document language, mostly based on SDLang, with xml-like semantics that looks like you're invoking a bunch of CLI commands!"
     />
     <title>{{ title }}</title>