Adding github icon on top navbar with proper functionality

[Ashu463]

PR Fixes:

1 This PR loaded with adding Github icon on navigation bar also added link in it of github of daily code. 2 Also the gitub icon to navbar performs well with theme switching from dark to light or vice versa. 3 As well as link attached to footer of github of daily code.

Resolves #[Issue Number if there] : This feature added by on my own, may be no any issue had been created yet.

[ ✔ ] I have performed a self-review of my code [ ✔ ] I assure there is no similar/duplicate pull request regarding same issue. From my end it is working well, also this feature helps to new contributors for getting instant link of github of daily code and contributing aggresively in it. Its preview is shown below in recorded video, please have a review on it. Thanks. Screencast from 21-04-24 12:43:22 PM IST.webm

[Ashu463]

Hey @hkirat this PR only adds github icon. please review and merge this.

[devsargam]

Sorry have to close this because of conflicts. Can you open a fresh one