Add Linked API skills: linkedin, linkedin-growth

[vprudnikoff]

Adds the following Linked API agent skills as skill directories.

General LinkedIn automation (linkedin)

• Path: skills/linkedin
• Fetch LinkedIn profiles, search people and companies, send messages, manage connections, create posts, react, comment, and run custom LinkedIn workflows from Claude Code, Codex, Cursor, and Windsurf.

Lead pipeline (import → qualify → invites) (linkedin-growth)

• Path: skills/linkedin-growth
• Import leads from LinkedIn or Sales Navigator searches, qualify them against an ideal-customer profile, schedule safe connection invites across accounts, track acceptances, and withdraw stale pending requests.

Source: https://github.com/Linked-API/linkedin-skills