2.1.3: Change skills directory

What's Changed

• chore: update readme by @dinh-pham-optimizely in #20
• chore: update skills directory + skills/agent content to reflect the change by @dinh-pham-optimizely in #21
• chore: update npm publish workflow by @dinh-pham-optimizely in #22

Full Changelog: 2.1.1...2.1.3