v2.6.3: Bump dependencies, add links to Siebly.io quickstart guides & tutorial

What's Changed

• feat(v2.6.3): link package docs to Siebly pages by @tiagosiebler in #160
• Kucoin QuickStart Guide: Kucoin JavaScript Getting Started
• Kucoin Tutorial Kucoin JavaScript & Node.js Tutorial

Full Changelog: v2.6.2...v2.6.3