Add LightCMS to Go section

[jonradoff]

Summary

• Adds LightCMS to the Go section of the list, in alphabetical order (between Ketchup and Ponzu).
• LightCMS is an AI-native CMS built in Go with MCP (Model Context Protocol) integration — 41 MCP tools for managing websites through natural language.
• Features include templates, assets, themes, collections, redirects, content versioning, and a REST API.
• Website: https://metavert.io

Checklist

• Entry is in the correct language section (Go)
• Entry is in alphabetical order
• Entry follows the existing table format (name, GitHub badge, stars badge, website badge, last-commit badge, description)