feat: docusaurus v2

Description

Upgrade docusaurus to v2.

⚠️ Have to be deployed simultaneously with new platform-ingress. platform-ingress!11

Related issue

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes