[Fix]-[665/666] - Add Keyboard Shortcut Guide and Custom Scrollbar

[pkmanas22]

PR Fixes:

• 1 feature: Custom Scrollbar Implementation #665
• 2 feature: Implement Keyboard Shortcut Guide #666

Resolves #665
Resolves #666

• Implemented a pop-up window to display keyboard shortcuts for the video player.
• Included navigation links to important sections of the application.

Checklist before requesting a review

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

[pkmanas22]

Please check @devsargam @hkirat sir , I think this is needful feature

[devsargam]

Can u actually create a cmdk key board shortcut?

[pkmanas22]

Yeah, I did that and also attached the screenshot for reference. I just added the working keyboard shortcuts, like during watching lectures some shortcut and some reference link also there just like https://excalidraw.com/

[devsargam]

This code is outdated

[pkmanas22]

Ok bhai, let me fix> This code is outdated