docs(website): add lead to the look section

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GbN3SgKFSNRhRYskbDPacJ

Author: jgrodziski

website/content/sections/look.md

@@ -1,6 +1,7 @@
 ---
 title: "What does it look like?"
 weight: 1
+lead: "A city of your code: packages are districts, classes are buildings, dependencies are arcs between roofs."
 cmd: "codegraph serve gson.jsonl"
 more:
   name: "Read the tutorial on reading a city"