feat: Redoc v3.0.0

[AlexVarchuk]

What/Why/How?

Redoc v3.0.0 release:

• Modern UI
• New Search Functionality
• Native Dark Theme Support
• Deep CSS Variable Customisation

Reference

Tests

Screenshots (optional)

## Check yourself

• [ ] Code is linted
• [ ] Tested
• [ ] All new/updated code is covered with tests