Outdated Link to First contributions

[lem0n4id]

I noticed that the link to the First contributors in this line is outdated. The repo has been moved under the first contributions org and the new link would be https://github.com/firstcontributions/first-contributions

Changes proposed in index.md

- * [First contributions](https://github.com/multunus/first-contributions) is a hands-on tutorial that walks you through contributions workflow on GitHub. When you complete the tutorial, you have made a contribution to the same project.
+ * [First contributions](https://github.com/firstcontributions/first-contributions) is a hands-on tutorial that walks you through contributions workflow on GitHub. When you complete the tutorial, you have made a contribution to the same project.

This is a great first issue for beginners 😛

[rishvantsingh]

OKh I will do it.

[hmnth07]

Hey @lem0n4id I have fixed it made a PR please accept it.

[lem0n4id]

Hey @hmnth07 , I actually don't have write access to this repo so I can't do that. Looks like this repo is not maintained anymore..

[hmnth07]

Oh okay, Thanks for the update @lem0n4id