feature: Implement Keyboard Shortcut Guide

[manask-pradhan]

Current Behavior:

The video player lacks a feature to display keyboard shortcuts and navigation links, hindering user experience and efficiency.

Proposed Feature:

Develop a pop-up window that presents keyboard shortcuts for the video player along with navigation links to essential sections of the application, akin to the pop-ups seen in Excalidraw and our application at https://app.100xdevs.com/.

Screenshot

From Excaildraw

After changes just similar to excaildraw

[manask-pradhan]

@hkirat sir, please review the code