docs: update next-ssr tasks

[shamshodisaev]

Title of Pull Request

Restructure next.js ssr tasks

🤔 This is a

• ⚙️ Update to an existing task
• 🔧 Update to an existing module

Description

• restructure next.js ssr tasks

Additional Information

https://github.com/rolling-scopes-school/tasks/blob/feature/ssr-tasks/react/modules/tasks/nextjs-ssr-ssg.md

Checklist

• ✅ I have performed a self-review of my own code.
• 📝 I have commented my code, particularly in hard-to-understand areas.
• 🔧 I have made corresponding changes to the documentation (if applicable).
• 🚫 My changes generate no new warnings or errors.

solved