docs: expand wiki pages Rewrite every page for 1.0.1 and add Game Modes, Accounts and Cloud Saves, Testing and CI, Contributing, FAQ, a sidebar and a footer. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012WWxQXoN7E7qrJHwbKJfyq