Expansion of supported skill import sources to include `https://skills.sh/`.

This feature request signals a clear user demand for expanding the `skills-manage` platform's integration capabilities. Users are actively seeking to consolidate skills from diverse, popular repositories like `skills.sh`. For a product positioned as a central hub for '20+ platforms,' the continuous integration of new, relevant skill sources is critical for maintaining competitive relevance and maximizing user value. Failure to incorporate such sources limits the platform's utility and forces users to manage skills across disparate tools, directly undermining the core value proposition of centralized management. Proactive integration of emerging skill ecosystems is essential for market leadership.