Feature/lecture and notion page

[niteshjangid29]

PR Fixes:

• 1 Added the Lecture Page Design (Theme Functionality, Fully Functional)
• 2 Added Pagination Design according to the new design (UI was not present in Figma)
• 3 Customized the Notion Page according to the new design. (Theme change is also working)
• 4 Both the Lecture and Notion Pages are responsive
• 5 Handled "Reply" or "Replies" based on replyCount (Also for Likes)

Resolves #888

https://github.com/user-attachments/assets/a4858a68-ec7d-4ac1-a002-5ab7e8940ce6

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

[ambesh333]

Bhai you could have mentioned me for the code sidha utha liya thoda tau different rakhta @siinghd

[niteshjangid29]

Bhai you could have mentioned me for the code sidha utha liya thoda tau different rakhta @siinghd

Bhai mene kuch uthaya nhi tha, khudse hi likha hai pura code. You should check my code once if tujhe aisa lga. I guess figma design diya hua hai to tumhe uthaya hua lg rha ho.

@ambesh333 @siinghd, I wrote the code completely.