feature: Add Github Organization Link

[zeul22]

I wanted to get to the repository via the website, however, there wasn't any link that navigated me here.

Solution: Add the GitHub Icon link in the footer and a "Contribute" section in the User menu to let beginners navigate easily to this organization.

[20santi]

@hkirat sir, please review the code

[manask-pradhan]

Add Keyboard Shortcut Guide and Custom Scrollbar #703

In this PR github is available, waiting for @hkirat sir's review of this PR

[zeul22]

Please reference all the changes made, I will close this issue once the PR gets pulled. Put out the merged PR reference out here once done.