Update URL firstcontributions.github.io

[whatzittoya]

Hello,

I noticed at URLs at translation files still used https://roshanjossey.github.io/first-contributions. Meanwhile at original Readme.md already updated to https://firstcontributions.github.io. So I took initiative and update 49 files translation.

I hope my PR will be accepted

Thanks

[Roshanjossey]

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