Adding a back to top button

[auralshin]

Good to add feature back to top button in Gitstart.tech website for easier navigation

[gitme-assist]

Thanks for opening this issue, a maintainer will be one his way to help you out in this 👍

[petersonjean]

a pr for this #4039

[therajaryan]

May I do this?

[auralshin]

@therajaryan go for it

[therajaryan]

@therajaryan go for it

I did a PR.