fix zensical repo widget config format

Move repo_url and repo_name to [project] section to enable
the repo info widget (stars/forks/version) in docs header.

Author: jaschadub

zensical.toml

@@ -2,6 +2,8 @@
 site_name = "AgentPin Documentation"
 site_url = "https://docs.agentpin.org/"
 site_description = "Domain-anchored cryptographic identity protocol for AI agents"
+repo_url = "https://github.com/ThirdKeyAI/agentpin"
+repo_name = "ThirdKeyAI/agentpin"
 nav = [
   {"Home" = "index.md"},
   {"Getting Started" = "getting-started.md"},
@@ -15,9 +17,6 @@ nav = [
   {"agentpin.org" = "https://agentpin.org"},
 ]
 
-[project.repository]
-url = "https://github.com/ThirdKeyAI/agentpin"
-
 [[project.theme.palette]]
 scheme = "default"
 toggle.icon = "lucide/sun"