Remove slack link

[satyam-mishra-dev]

Replace link to slack in 'Where to go from here' section in Bengali translation of Readme and put a link to code contributions like in English Readme.

💡 Possible solutions
Remove link to slack in Bengali translation and put a link to code contributions repo similar to main Readme.
You can find it in https://github.com/firstcontributions/first-contributions/blob/main/docs/translations/README.bn.md#%E0%A6%AA%E0%A7%8D%E0%A6%B0%E0%A6%A5%E0%A6%AE-%E0%A6%85%E0%A6%AC%E0%A6%A6%E0%A6%BE%E0%A6%A8%E0%A6%B8%E0%A6%AE%E0%A7%82%E0%A6%B9

Important

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

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[cassiasamp]

Hi @satyam-mishra-dev, Id like to start working on this issue

[cassiasamp]

It seems the link to slack was already replaced in line 124..if theres anything else to help with, let me know 😊

[Jk319]

Hi @satyam-mishra-dev, Id like to start working on this issue