feat: wire imessage-plugin into home page + navbar

Add imessage-plugin to config.extra.projects so it shows up in the
projects dropdown and home-page grid alongside Bookmarks, MotherDuck
CLI, and Zorto. Peer of the ready projects, not incubating.

Author: lostmygithubaccount

config.toml

@@ -32,6 +32,7 @@ menu_items = [
 
 projects = [
   { name = "Bookmarks", url = "/bookmarks", github = "dkdc-io/bookmarks", description = "Bookmarks in your filesystem." },
+  { name = "iMessage Plugin", url = "/imessage-plugin", github = "dkdc-io/imessage-plugin", description = "iMessage MCP plugin for LLM CLIs." },
   { name = "MotherDuck CLI", url = "/md-cli", github = "dkdc-io/md-cli", description = "CLI for the MotherDuck REST API." },
   { name = "Zorto", url = "https://zorto.dev", github = "dkdc-io/zorto", description = "The AI-native static site generator (SSG) with executable code blocks." },
 ]