docs: redesign teaching README

[Functionhx]

Summary

• replace the dry project overview with a visual, teaching-first README
• add a code-native ActuateX hero and a compact real-rollout GIF for Isaac Gym, Isaac Lab on Isaac Sim, and MuJoCo
• organize setup, seven course labs, experiment evidence, code-reading routes, scaling guidance, roadmap, and provenance into one learning path
• keep failed sim2sim results and licensing status explicit

Validation

• python scripts/verify_repo.py
• python -m compileall -q backends tools scripts
• git diff --check
• npx --yes markdown-link-check README.md --quiet

[Functionhx]

Superseded by a clean project-facing branch without the automated agent prefix.

[Functionhx]

Anyone who use AI-generate code that not be detailed reviewed will be blocked from the resiposity!