Integrate Documentation from docs.rs.school into rs.school

[SpaNb4]

📝 Describe the feature

Integrate documentation from https://docs.rs.school into https://rs.school site to improve user experience.

ℹ️ Additional context

Currently, documentation on docs.rs.school is not easily accessible. This integration will enhance visibility and usability for users.

✅ Definition of Done (DoD):

1. Content from docs.rs.school is migrated to rs.school without loss.
2. Search functionality for documentation is implemented.

[cootook]

@SpaNb4 is that issue related to #623 ?

[SpaNb4]

@SpaNb4 is that issue related to #623 ?

@cootook No, this issue is not related to #623. I'll update the description shortly