meta(aeo): Improve homepage schema and discovery docs

Add visible FAQ and concepts content, strengthen tool-specific integration
guides, and publish a dedicated skills-vs-MCP explainer.

Extend homepage SEO metadata and JSON-LD so the GitHub Pages catalog
better reflects the repository's real positioning and common user
questions.

docs/users/codex-cli-skills.md

@@ -4,6 +4,14 @@ If you want **Codex CLI skills** that are easy to install and practical in a loc
 
 Antigravity Awesome Skills supports Codex CLI through the `.codex/skills/` path and gives you a wide set of reusable task playbooks for planning, implementation, debugging, testing, security review, and delivery.
 
+## How to use Antigravity Awesome Skills with Codex CLI
+
+Install the library into your Codex path, then invoke focused skills directly in your prompt. The most common pattern is:
+
+1. install with `npx antigravity-awesome-skills --codex`
+2. choose one workflow-oriented skill such as `@brainstorming`, `@concise-planning`, or `@test-driven-development`
+3. ask Codex to apply that skill to a concrete file, feature, test, or bugfix
+
 ## Why use this repo for Codex CLI
 
 - It supports Codex CLI with a dedicated install flag and a standard skills layout.