Version 4.0.0 - Nextra release

What's Changed

• Nextra POC by @louis-md in #290
• Update docs for next SDK release by @germartinez in #317
• Fix broken links by @germartinez in #319
• Refactor Footer component and fix links by @germartinez in #320
• Resource hub by @louis-md in #323
• Add glossary by @germartinez in #324
• Replace Goerli with Sepolia by @germartinez in #316
• Update supported networks by @germartinez in #325
• Update README file by @germartinez in #326
• Update development script by @germartinez in #327
• Deploy to staging from main branch by @germartinez in #328
• Fix release script by @germartinez in #329

Full Changelog: v3.1.0...v4.0.0