Remove slack link in Armenian translation

[Roshanjossey]

🐞 Problem
We're moving away from using slack

🎯 Goal
Have no links to slack

💡 Possible solutions
Remove link to slack in Armenian translation.
You can find it in https://github.com/firstcontributions/first-contributions/blob/main/docs/translations/README.arm.md?plain=1#L2

Important

Please only address one issue in a PR.
Let's make it possible for more people to solve issues here.

📋 Steps to solve the problem

• Comment below about what you've started working on.
• Add, commit, push your changes.
• Submit a pull request and add this in comments - Addresses #<put issue number here>
• Ask for reviews in comments section of pull request.
• Celebrate your contribution to this project.

[amit15000]

I have started working on it.

[nadhamsaipallavi]

I have not seen the changes yet so i would like to contribute for this issue

[nadhamsaipallavi]

I have raised the PR Request can you please review it