Implemented a side appbar for easier navigation within the course sec…

[Pawank06]

…tion.

PR Fixes: #888

• 1 Added side appbar to the course route
• 2 Improved navigation within the course section

Resolves #888

https://github.com/user-attachments/assets/4696b2b4-8ebc-4495-b12b-27aa68d358ed

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I assure there is no similar/duplicate pull request regarding same issue

[siinghd]

@Pawank06 will wait for this, many PR with new design

[Pawank06]

@Pawank06 will wait for this, many PR with new design

could you please elaborate. I'm not entirely sure I got your point.